Checkpoint and seating logic to make your platformer levels 1 PLAYER ONLY, and still allow for grappling hooks and real water. This is not a level, it's only a tiny demo area and scoreboard prize give away.
Played with this the other day - wow, this is a really well-built system. Very useful for levels that require 1 player only. Just about everyone who wants to build a platformer with 1 player needs to check it out.