Yumak is a free logic puzzle game available on the iPhone. Developed by Berk Yuksel, this game offers a unique and challenging gameplay experience.

In Yumak, the chance factor is minimized, and the game relies solely on the player's thinking ability. The objective is to solve a puzzle by placing every button/node to its target place in a 2D NxN matrix. Each button/node is indicated by a hole and a rope attached to it, representing its target position.

The gameplay involves making swaps with other nodes in order to place them in their correct positions. Swaps can be made horizontally or vertically. However, the strategic depth of Yumak comes from the fact that swapping two nodes also causes the in-between nodes to swap. This means that simply placing the nodes one by one in their original places will not work in most cases.

To succeed in Yumak, players must utilize the in-between swapping functionality to solve multiple nodes at once. This requires careful planning and consideration of the remaining moves and time limits. Yumak offers a challenging puzzle experience that will put players' thinking skills to the test.