Threes is a game that tasks you with matching up numbers to form larger numbers. You start off by match 1s and 2s to make 3s, then you match 3s to 3s to form double the number and continue that as high as you can.
It's a simple and easy game to play and each round can take just a few minutes to complete, which can be great if you have a little bit of downtime at work. Plus, it can be pretty addicting, so don't be surprised if that few minutes of downtime turns into more than that.
If you plan on getting into Threes, perhaps checking out our post on tips and tricks is in order.