A free program for Android, by HardCore Soft.

Super Billy’s World: Jump and Run is a classic platformer game with a unique twist. To play, simply hold down the jump button for a high jump, and use the joystick or buttons to move and fire. To become stronger and defeat all the monsters that stand in your way, eat mushrooms and other items that will give you the boost you need.

The gameplay takes you back to your childhood memories with the epic mission: Princess Rescue. You have to help Princess get back to her home and save her from the evil dragon. This is a classic platformer game with a unique twist that will keep you on your toes. The gameplay will challenge your logic and cognitive abilities as you have to think through all the different levels to get to the next one.