Robot Rampage

Robot Rampage is an old calculator game made by Tangent. The game was probably originally programmed for the Casio 50FH calculator, and a Casio 3650P port was probably made. This game was influenced by RPGs and the Game Maker "what makes a good game" tutorial, and has gone to influence battle mechanics from Tangent's later games like Monsters Menace America: Rampage, KanSore: Ship Girls vs Battleship, and Aged Maid (the PC game). The style of combat derived from Robot Rampage has been called "Robot Rampage style (combat system)".

Gameplay
The game starts the player off with the lowest stats on attack, defense, and health, and pits them against the first robot, which is the weakest. As a stable of Tangent's calculator games, the main part of the game involves guessing an integer. If the player guesses correctly, they can deal damage to the enemy robot. You/robots' attack increases the damage you/deal deal and defense neutralizes attack points.

It is forgotten whether the robot needs to guess a number picked by you to hit you, or if an incorrect guess by you immediately results in a hit from the robot.

If the player defeats the robot, the player is given a chance to upgrade their character on either attack, defense, or health. If health is chosen, they earn more health points than attack/defense points if they chose those. The player then fights the next robot, who is equivalent to the last robot, but having upgraded in all 3 aspects.

Impact
After the unforgiving nature of the robots' upgrading in comparison to the player's has been observed, later games go for a more tame enemy upgrading system. For instance, in KanSore, the enemies upgrade in only their attack or defense, not both.