What can you do with an Arduino? Well, check this original post
to see more.
Multidruino is multifunctional arduino based device than can be used as multimeter, game console, components tester, alarm clock, calculator, mini pc, music player and much more. You can use it for making and playing games. You can make little aps like calculator or drawing program. You can coonect various sensors to it. Posibiltieas are great for this little device. you just need idea. On this site you can find many examples for this device.
To order your boards, use JLCPCB.com
and select your color.