Most iOS devices, Android devices, and Mac computers purchased from 2014 onward are compatible.
Mac Computer (USB only)
Must be running OSX 10.8+ and note that even if your Mac has Bluetooth, you must use USB for Mac computers
iPad 3+, iPad Air, iPad Pro, iPad Mini Air, iPhone 4s+. Not compatible with iPad 1 or 2, not recommended for iPad Mini (1st Generation)
How can I tell what iPad model I have? (MacWorld.co.uk)
Android version 4.3 or newer and Bluetooth 4.0 LE. Check full compatibility using GSMArena’s “Search” feature at top of screen. After you search, look under “COMMS” for your device and make sure it is v4.0 or newer
Not Compatible with Windows, Kindle Fire, or Chrome book
Puzzlets games are not compatible with Windows, Chromebooks, Kindle Fire, or RCA Voyager devices