You can play Tunnel Rush in a99.io as unblocked.
Tunnel rush unblocked is played on the computer by pressing the arrow keys on the screen and the arrow keys on the screen. You are moving fast in a hexagonal pipe. There is a red block in this pipe. These obstacles turn right and left around their axis. But there are gaps between the obstacles for you to pass. Use the arrow keys to adjust yourself to pass through the gaps between obstacles. Each meter you move back as you score. The game is over when you hit any obstacle. Play the tunnel rush game by crossing all obstacles and moving to the end of your boat.