Star Force (1984 Tehkan)

A Shooting 'em up game where you pilot a ship in space over a series of islands shooting enemy spacecraft and ground-based targets. There are special symbols that appear at regular intervals which can be shot for bonus points or power-ups. Each level has an end boss that must be defeated before proceeding to the next level. The levels themselves are designated by Greek alphabet letters.

This game is known in the US as Mega Force.

This game has 120 levels and it's endless. After 89 levels, the level counter stays at 89. After 120 levels, the game is restarted all the way from level 1 over and over again and never ends.