AirDroid - Highly Recommended! Connects your android phone to your PC via wireless. Transfer files from PC to phone or vis-versa. It also lets you send texts, plus loads more features. No software to install on your computer, just the phone app.
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100 Floors - A great entertaining game. Try and find a way to open the lift door to gain access to the next floor.
Dooors - Room escape game. Just like 100 Floors.