|Code license||GNU Affero General Public License v2.0|
|Media license||GNU Affero General Public License v2.0|
|Tunnel is a free game. This means that the source code is available to be studied, modified, and distributed. Most projects look for help with testing, documentation, graphics, etc., as well.|
Tunnel is a web based arcade game wherein the player controls a ship through a tunnel. Gravity constantly pulls the ship downward, which needs to be compensated for with thrusters. Thereafter are bonus items to collect and the tunnel gradually contracts into itself while gravity intensifies.