Time to flex your mental muscles on some new math and logic puzzles! The rules are simple: 1. Connect tiles so that the their sums match one of the goal values (e.g. 4 = 2 + 2, 7 = 9 - 2). 2. Round tiles can be used more then once. 3. Some levels also require that all cells in the grid must be filled.

http://armorgames.com/play/17969/sum-links