The game Move the Rubber Bands offers you an interesting puzzle. Its main elements are multi-colored rubber bands and gray pegs. The task is to move each rubber band to the place corresponding to its color. To do this, you will gradually move the rubber band from peg to peg. If there is no free peg in the rubber band's path, you can add one if there is a plus sign there. In this case, the peg can be bought for a green card. You will have one in stock, and the rest can be purchased by watching ads in Move the Rubber Bands. The problem is that the elastic bands cannot stretch indefinitely and you will have limited time to solve the level problem.
