Apple has updated its free app of the week. This time around it’s Roofbot: Puzzler on the Roof which is free all weekend until next Thursday. So, if you have some spare time why not give your brain a workout?

Previously priced at $3, this app is universal and available across iPhone and iPad. The premise is that you have to guide Roofie across rooftops, by placing colored energy balls into slots. However, the challenge ramps up as the architecture switches and changes.

Download Roofbot: Puzzler On the Roof for free on the App Store now:

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Watch the game in action below: