Sum up the numbers is a free puzzle game available on Android that is perfect for passing the time. Developed by UnknownProjectX, this game challenges you to match the block numbers with the line numbers within a limited time period.

The game is simple and straightforward, yet it is also interesting and engaging. The objective is to add up the numbers on the blocks to match the line number before time runs out. It is a great way to keep your mind active and entertained whenever you have a few spare minutes.

Overall, Sum up the numbers is a fun and addictive puzzle game that will keep you entertained and challenged. If you are looking for a way to kill time and exercise your brain, this game is definitely worth checking out.