One way to make your game last longer is to make item you need to advance impossible to find.

Bill and Ted's goes a step farther by filling each level with crazed enemies you have to avoid, giving you no time to look for stuff. Each level has a historical figure you need to find and draw into your time machine with you with one of these un-findable items by switching between two heroes stuck in parallel timelines. The game confused us on so many levels.

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