Hopper is a casual, arcade game in which players control a kangaroo navigating through single-screen levels filled with crates. The core mechanics involve moving in all directions and pushing crates to trap or defeat enemies. In this game, the player must escape from three circus trainers who chase the kangaroo across the levels. To eliminate the trainers, the player pushes crates onto them, requiring strategic movement and timing. It stands out with its simple yet engaging gameplay, reminiscent of classic arcade titles like Pengo, and is designed for the Texas Instruments TI-99 platform, offering a nostalgic experience with its straightforward mechanics and challenging levels.