Warning Forever is a freeware fixed shooter for Microsoft Windows written by Japanese developer Hikoza T Ohkubo and released under the name of his software house, Hikware.

There are no power-ups - the player's only weapon is a very rapid-fire revolving cannon which is fired by holding down the shoot button (Z key by default).

Alternatively, after the switch button (D key by default) is pressed, a green arc is displayed originating from the ship and widening as distance increases.

The arc will rotate slowly to face the direction opposite the ship's motion.

[4] Eurogamer's Jim Rossignol named Warning Forever among a top 20 list of Summer of PC Freeware games in 2006.