Warning Forever

Warning Forever is a freeware 2D shoot 'em up written by Hikoza T Ohkubo and released under the name of his software house, Hikware.

The premise of the game is to fight a constant stream of bosses. The gameplay is broken into stages; each stage is a single boss battle. To progress to the next stage, the boss must be completely destroyed within the time limit. The game starts with a time limit of 180 seconds, with 30 seconds being gained for every boss defeated. 20 seconds are lost every time the player is destroyed.

The main gameplay feature is how the bosses change from stage to stage. Based on how you fight a boss, the next boss will adapt itself to defend against your strategies, and prey on your weaknesses. For example, if you destroy the front part of the boss first, it will increase armor on the front. Likewise, if you are killed by a certain kind of weapon, but still defeat the boss, the next boss will probably have more of that weapon.

The player flies a relatively small green ship. There are no power-ups - the player's only weapon is a very rapid-fire revolving cannon which can fire in any direction, and widen or concentrate its projectile spread.

There is one initial boss, the Pure Heart, and nine other intermediate evolutions: Muramasa, Phoenix, Berserker, Scorpion, Hekatoncheir, Big Magnum, and Hammer Head. After that, there are four final evolutions; The Infinity, The Apocalypse, The Catastrophe, and The ISE-ONE. The first three final evolutions come after the nine intermediates, but the ISE-ONE is a direct evolution from the Pure Heart.