Mem Blocks Challenge

Put your memory to the test against millions of people! Remember where all alien faces are for when the matching card is turned up later in the game.

Each round you will have to solve the same game as your opponent. The first one to solve it will win the game and improve his rating.

See world, country and personal stats based on ELO multiplayer ranking system. Visit our Facebook page to keep up to date on all the latest brain challenge news and posts from our 'Fans' and 'Followers'.

Usage tips:

- Click on "?" sign to turn cards

- Post your achievement on Facebook or Twitter

- Invite friends by e-mail

All you need is an internet connection, good memory and quick fingers!