2048 Change

Users slide numbered tiles around a 4x4 grid, matching up similar numbers in an effort to get a cube that adds up to 2048.

When users can no longer combine numbers, they'll see their score.

2048 is a math exercise hidden in a terrifically addictive matching game.

Rather than simply trying to post as high a score as possible, though, this one sets a task, users must combine numbers to the point that they add up to 2048 in a single box. That means initially matching 2s, then 4s, then 8s, etc., until a pair of 1024s are next to each other.

It's a small, but wonderful twist that makes the gameplay seem new. And having a task to aim for keeps people playing (as well as trying to better the scores of their friends).

Like any of the best games, you'll quickly understand the point and do fairly well -- but it will be a long, long time before you truly master the game.