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TLDR - What this guide covers
The Reset Trigger
is useful in platformer mode if you want to reuse a checkpoint or collectable that has been picked up by the player. In order to reset these, you need to have them on a group ID that matches the ID used in the reset trigger.
The example below has a checkpoint and six coin collectables assigned to group ID 1. Touching the reset trigger resets everything under that group ID.
The Reset trigger also works on breakable blocks too.
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sparktwee.