Isoball 3: A challenging mental exercise where you construct a pathway for a ball using a fixed set of resources like blocks, inclined planes, bridges, elevators, and directional. In some cases there are multiple solutions to a level. This game is free and runs in Google Chrome.

In the attached photo of level 75, the blue ball drops from the chute, runs down the ramp, gets an added boost from the conveyer belt, makes a right and rolls across a power bridge though a tunnel that pops out at the upper right. From there, the ball goes down the 3-level elevator, makes two more right turns and heads into another tunnel popping out at the upper middle. After passing though the four tunnel openings, the target doors open in the lower left and the ball makes its final descent in the four-level elevator.