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In this video, we will add
the new mechanics to our obstacle course.

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As you can see, we'd changed the layout
compared to the previous series.

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You can find this updated level
in the ObstacleCourse_Part 2 directory,

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and go down to ObstacleCourse.tscn.

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I'll let you open that one.

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We changed the level to adapt it
to our new obstacles

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which we're going to add.

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Now, we can start
with a pressure plate and a door.

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Expand the obstacles directory, doors.

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We're going to start by adding them
as children of the obstacles node

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as we already have it.

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I'm also going to hide everything
that adds visual noise.

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Click the icon next to the OffCourse node
and the Info node.

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With the Obstacles node selected,

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we can drag and drop
a pressure plate first.

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The thing that I want to do here
just to show you

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is to add doors here on the bridges
to block the player.

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Now, if a door is connected
to a pressure plate,

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we can open the door
by walking on the plate.

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But if the door is alone,
it's just going to block the player.

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We also have a pickup

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that allows the player to go through walls
and through doors.

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We're going to combine these
to create a little game loop

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or level loop, if you want.

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I'm going to press CTRL+Z
a couple of times here.

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I start with my pressure plate.

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Then going to select the plate
and I want to add a door as a child of it.

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I'm going to select a door horizontal
and place it on the bridge.

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Now, the way while placing the nodes
is not as precise as could be.

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We're going to use grid snapping
to place them more accurately.

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You can press Shift+G

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or you can use the icon
up there in the toolbar.

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If you don't have the settings
from previous projects,

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you can go to the three dots,
Configure Snap,

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and ensure that the Grid Steps
are 64 by 64,

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then click okay.

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When I try to click
on the pressure plate or the door,

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the remaining time is getting in the way.

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So I'm going to hide this node
as well for now.

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Now, I can select the pressure plate.

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And when I click and drag,
it's going to snap to a grid cell.

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You can see that the door moves
with the plate due to our setup.

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It's possible in Godot to make children
move independently from their parent

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but that's a bit beyond the scope
of this tutorial.

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All you have to do is move
the plate first,

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and then you move the door,
and snap it.

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You can just click and drag
on the nodes

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to select and move them quickly,
which is quite convenient.

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All right, so we have the plate
with a connected door.

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Now, I want to add doors here,

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but I don't want them
to be children of the plate

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because I just want them
to always block the player.

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I select the Obstacles parent node,

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and then I'm going to drag
the door horizontal onto the level

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and it's going to snap to the grid.

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You can see that it gets added
as a child of the obstacles node.

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And then same for the door vertical.

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I'm going to click and drag
it onto the bridge there.

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We can now press F6 to play the game.

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You can see that we have the animation

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that prevents us
from quickly testing the level,

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which is a little bit inconvenient.

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It'd be nice if, at least for testing,
we could turn it off.

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We can do that by going
to the ObstacleCourse script

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and click the script icon to open it.

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In the ready function,
we're going to do two things.

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What the start animation does...

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I'm going to go back
to the animation player to show you.

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Is it animates the numbers
and then calls the start function.

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One thing we can do
is at the start of the game,

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we move the animation to the end
so it hides the number.

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And then doing that will not call
the start function

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so we have to call it manually.

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I'm going to go back
to the ObstacleCourse script

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and at the end of the ready function,

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I'm going to get the animation player
and call it seek function.

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It's going to move the time cursor
on the animation timeline

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so we could move directly
to three seconds

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to the end of the animation.

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Or you can use
the infinite constant in Godot

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to say, "Go to the end of the animation."

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It's going to be limited
by our animation's limit.

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The advantage being that this works
with any animation in Godot.

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And then we're going
to call the start function.

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We can do that, press F6.

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You can see that we can instantly
play the game, walk on the plate.

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And when we do so, the door opens,

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we can quickly go through it
and get to the next platform.

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Well, we still have the timer running,

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so one thing we could do
is stop the timer.

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But for now, I want us to focus
on one issue that we have in there.

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It's how we move in front and behind
the pressure plate.

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This happens because we place the plates
in the Obstacles node.

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It's a node of type YSort.

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So it's going to sort the plate
with the player

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based on their vertical position.

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If I place Godot above the plate,
it shows behind it.

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If I place Godot below the plate,
it's going to show up in front.

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We don't want that.

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One thing we can do is group these nodes
under a new node 2D.

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That will cut the Y sorting.

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We can add that one
as a child of the obstacles.

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Press Ctrl+A and add a new node 2D
that will call doors, for example.

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And then we're going to move
the pressure plate and the two doors

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into the doors node.

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That's one problem solved.

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Now, they always show behind the player.

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Well, maybe you would want the doors
to show up in front or behind the player

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but for now, we're going
to keep things simple.

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The last thing that we want to complete

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our little level loop is to place
a ghost pickup down there.

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So that the player can grab the pickup

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and go through the doors
and through the obstacles there.

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Select the Obstacles node, again.

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This time, we go to the pickups directory
in the file system dock,

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and click and drag the pickup ghost
onto the platform.

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Place it wherever you feel is good.

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You can see I have particles
in this video.

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We'll add them in the next lessons.

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You can now play, go through the door,
get the ghost pickup.

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If you don't hit the slow zone,

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you should be able to pass
through the walls.

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It's a bit difficult at the moment.

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You have to be good at games,
which I'm not.

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You can see that you can pass
in front of the door,

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and avoid the push wall and everything.

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That's a little level loop done.

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I invite you to do the same
and fill the level

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with a couple of mechanics like these
just to have fun, to relax a little bit

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before we move on to the other tasks.

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One quick tip, if you want to test
the mechanics

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in a different part of the level,
you just move Godot, the character,

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to some other place
where you're going to put

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some other mechanics.

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Say I go to my obstacles,

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I'm going to add a speed pickup in there.

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Or maybe, I'm going to add
the speed pickup on this island.

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You get it, you go fast,
and you have to handle the turns

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to get onto this platform.

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So I can place Godot
on the bridge and go down.

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And when I go faster...
It's a bit hard to manage the time.

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So maybe, you want to place
the speed pickup around there.

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So you move in a curve
and try to enter the bridge horizontally.

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You can move Godot in the scene
to quickly test your level loops

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in different parts of the level.

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You can see you have a couple of bridges.

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They're all pretty good
to place pressure plates and doors.

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And a couple of places are good
as well to place some pickups.

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While filling up the level
with those pickups and those doors

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is the same thing everytime.

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You're going to place
some doors, some plates.

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You're going to test, move them,
and test again, and so on.

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Once you are done, you want to move Godot
back to the start position up there.

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And you want to be sure
to go back to the script,

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remove these temporary lines of code

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and resolve the visibility
of the UI nodes.

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That will allow us to play
the level like normal.

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Now, the obstacle course
is a bit bigger than before.

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So maybe, you want to also adjust
the timer's duration.

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It was set to 12 seconds,
but maybe you want to go up to 15 or 20,

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or something like that.

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Just to leave the player the time

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to explore the level
and reach the finish line.

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In the next video, we'll add
the floating styles that you can see

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on the pickups just to make
the game feel a tiny bit nicer.

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See you there.