Warning Forever

The game is broken into stages; each stage is a single boss battle, resulting in a constant stream of bosses. To progress to the next stage, the boss must be completely destroyed within the time limit. The game starts with a default time limit of 180 seconds, with 30 seconds rewarded for every boss defeated and 20 seconds lost for each time the player is destroyed.

The player flies a small green ship. 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). By default, it fires straight ahead with a small spread. 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.

Download.com awarded the game a 5-star editor's rating and described the game as a classic in the making, "Warning Forever will entice nearly every gamer who enjoys a space shootout". The staff of Computer Gaming World, writing for gaming blog 1up.com said "This game is among the most addictive platform shooters in the business".

Eurogamer's Jim Rossignol named Warning Forever among a top 20 list of Summer of PC Freeware games in 2006. Other reviews are from IGN and Rock, Paper, Shotgun. This game is part of the permanent collection of the travelling exhibition Game On 2.0, shown for instance in the Ontario Science Centre 2013, as example in the category Indie games.