OSKI

Oski is very simple board game. OSKI can be played as paper-and-pencil game. There exist version for iPad too where you can play OSKI in several languages. You can play online OSKI on LittleGolem.

OSKI rules

OSKI on iPAD

OSKI on BoardGameGeek

OSKI on LittleGolem

If you want play OSKI as paper-and-pencil game, there is a printable PDF doc.