NumSum is an infinite numbers possible that is easy to master. You must connect multiple white tiles to a blue tile so that the sum of the white tiles is equal to the blue tile (e.g. white tile 8 + white tile 6 = blue tile 14).
You must use all tiles and draw as many paths as there are blue tiles. If there are three blue tiles, you must draw three paths. Paths cannot cross and all tiles must be used.