Master Navigation Play in Roblox Studio

What can we use if we can't find a SpawnLocation or SurfaceGui in Roblox Studio?

If SpawnLocation or SurfaceGui aren't available, place a regular Part named "StartSpawn" and add a Script that sets player.Character.HumanoidRootPart.CFrame to StartSpawn.CFrame on touch, and for the Finish display use a TextLabel inside a BillboardGui attached to the Finish part instead of SurfaceGui.

Why doesn't touching a checkpoint always set my respawn and how do I fix it?

If touching a checkpoint doesn't update respawn, ensure the Script you pasted is inside each checkpoint Part (including renamed duplicates like "Checkpoint2"), confirm the script's Touched/Touched connection code is intact exactly as pasted, and verify each checkpoint Part's Name matches what the script expects.

How can I change the activity to suit different ages?

For younger kids make fewer, wider Parts with bright Colors/Materials, closer spacing and one easy Checkpoint, for elementary kids use the six platforms and multiple Checkpoint parts as written, and for older kids add smaller gaps, moving Parts, timed runs and custom checkpoint scripts or a SurfaceGui leaderboard for more challenge.

What are simple ways to extend or personalize the obstacle course after finishing it?

Personalize and extend the course by giving each platform a themed Color/Material, adding Sounds and a SurfaceGui or BillboardGui message at intermediate checkpoints, creating moving platforms with simple scripts, and adding a finish Script that displays "You Win!" on the Finish TextLabel before you Share on DIY.org.