Construct 2

My favorite tool for quickly prototyping game ideas is the excellent Construct 2 from Scirra

There are a lot of fiddle bits when developing a game that are best sorted with a tool like Scirra. For example, how quickly should a sprite move across the screen when chasing the player to "feel" right?  That kind of design question is really easy to answer when using a tool like Construct 2.

My only regret is that Construct 2 only runs on Windows - fortunately, the upcoming Construct 3 should also run on Mac OS X. 

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