Game Tools.

This is a regularly updated list of game design tools, sounds and graphics. Everything on this list is primarily free, or has a free trial period. The best way to get familiar with game design tools, is to start using them - search for which tools suit your skill level and project and have a play.
Decide on which tools you'd like to use

BFXR

Online or downloadable tool which allows you to easily (with one button press!) create and edit sound effects for your game.

More information about BFXR

Scratch

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More information about Scratch