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 default time limit of 180 seconds (which can be changed to the maximum of 999 seconds in Options), 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.

Boss Parameters
Before each battle a chart pops up showing you the strengths of the upcoming boss. There are six categories:

Front - Indicates forward strength

Rear - Indicates rear strength

Defense - Indicates defense

Core - Indicates strength of the "core" (destruction of the core destroys a boss)

Search - Indicates boss' ability to track down the player

Generator - Indicates quantity and speed of enemy gunfire

Weapons
Vulcan - Basic machinegun-style turrets. Stronger generator increases projectile amount.

Laser - Laser cannons that shoot pink beams. Strong generator increases beam thickness.

Cannon - Cannons that shoot spread of blue energy-balls. Stronger generator increases amount of shots per spread.

Smash - Turrets that shoot shotgun-style projectiles. Stronger generator increases projectiles fired.

Needle - Turrets firing a stream of needles

Homing Missile - Homing missile launchers. Stronger generator increases homing capacity and number of missiles shot at once.

Pincers - Some of the bosses have "wings" with which they will attempt to enclose the player.

Ram - Some bosses have thrusters and will attempt to corner and then ram the player.