If you're looking for a cheap way to enjoy electronics, have fun and perhaps get some exercise then making your own laser tag game can fit the bill. The folks at Instructables have created a very easy to replicate version that uses universal remote controls instead of "laser guns", and built Arduino-powered receivers that can detect any IR signal from the remotes and register a hit.
Each player's vest is fitted with three IR receiver sensors, a piezo buzzer for sound effects and the Arduino sketch can learn the signal from the remotes to make rounding up enough controllers a simple task. And the final results looks like fun, as shown in the following video:
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Apart from being one of the smallest Arduino-compatibles on the market with USB, it also has an onboard RGB LED and piezo which can be used a knock sensor and various tune and sound effects. Plus you can add extra circuitry with the matching protostick! For more information and to order, click here.