🎢 Episode 6 · Advanced · Full Tool

Save the Guests
Episode 6: Build Swim Rescue

This is the big one. You bring together events, guest positions and actions to build a real tool that catches guests in the water and saves them before they get upset.

👶 Ages 10+ ⏱️ ~1 hour 🎢 OpenRCT2 ✓ Free workshop
🛟 Full feature 🧠 Logic ⏱️ Tick safely 🧪 Play-test
🛟 Start Step 1 ← All Episodes
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Build it in our OpenRCT2 Studio too: set up a park plugin, wire up events, read the park and export real plugin files in the browser, with no install. Open the OpenRCT2 Mod Studio →
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Ember says: this is the same idea as the Swim Rescue workshop, but now you understand every piece. Build it once and you will trust it, because it is all yours.
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Want a guided version? The Swim Rescue workshop walks through a related build step by step.
1
🗺️
Plan the Tool
One clear job
Active
🎯
Goal for this step

Write one sentence describing exactly what the tool does.

  • 1Good tools have one clear job.
  • 2Ours: "Find guests in water and move them to the nearest path."
  • 3Write your sentence before any code.
✏️
Fill in the Blanks
+15 XP
A good tool has clear job.
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Knowledge Check
+15 XP
Why start with one clear job?
ASo the tool is simple and works
BSo it is longer
CSo it is slower
2
🧠
Spot a Guest in Water
The core check
Locked
🎯
Goal for this step

Decide if a guest is in the water.

  • 1Each guest has a position and a flag for being in water (or you can check the tile under them).
  • 2Only act on guests who are in water.
  • 3Leave everyone else alone.
if (guest.isInWater) {
  // rescue this guest
}
✏️
Fill in the Blanks
+15 XP
We only rescue a guest when guest.isIn is true.
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Knowledge Check
+15 XP
What should the tool do for guests not in water?
AIgnore them
BTeleport them too
CDelete them
3
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Send Them to Safety
Find a path and move
Locked
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Goal for this step

Move the guest to the nearest path tile.

  • 1Find a safe tile near the water edge.
  • 2Set the guest position there.
  • 3Post one cheerful message, not one per guest (that would flood the screen).
✏️
Fill in the Blanks
+15 XP
Send a guest to the nearest tile.
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Knowledge Check
+15 XP
Why save up the messages and post one, not many?
ASo the screen is not flooded
BBecause messages cost money
CMessages are limited to one forever
4
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Run It Safely
Pick the event
Locked
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Goal for this step

Choose how often the check runs without hurting performance.

  • 1Checking water on every tick is safest for catching guests fast, but must be light.
  • 2Only look at guests near water if you can, to keep it quick.
  • 3Test on a busy park and watch the frame rate.
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Knowledge Check
+15 XP
If the game slows down after adding your tool, what do you check first?
AHow often your code runs
BThe colour of the UI
CThe park name
5
🧪
Play-Test It
Break it on purpose
Locked
🎯
Goal for this step

Try to make the tool fail, then fix it.

  • 1Drop guests in water in several places.
  • 2Put a guest in water with no nearby path.
  • 3Fix the odd case so the tool never crashes.
✏️
Fill in the Blanks
+15 XP
Testing the odd is what makes a tool trustworthy.
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Knowledge Check
+15 XP
What separates a toy from a tool?
AHandling the odd cases without crashing
BA longer name
CMore colours
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Swim Rescue Works!
You built a real park tool from scratch. Next you will get it rock solid and handle anything the engine throws at you.
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Total XP
1
Level
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Best Streak
0%
Accuracy
Next: Episode 7: Test and Debug →