One Eyed Monster War is a fictional game that is one of the games found on the fiction EXsorbeo handheld gaming device found in the world of GTA: San Andreas. In this game, there are a lot of sexual innuendos. "One eyed monster" is one of the many things that a penis is called, and it will shoot "sticky goo" at the player. In fact, moving the spaceman up and down simultaneously simulates masturbation. The game was made available to play on the EXsorbeo website (no longer exists) through the means of an EXsorbeo "emulator" as a promotional tool for the worldwide launch of GTA: San Andreas.
The game sort of plays like a boss fight. You move your spacemen up and down and shoot your gun which shoot plasma at the monster. You have to avoid the "sticky goo", but to cause any damage to the monster you have to shoot it directly in the eye. Over time, the "one eyed monster" will begin to descend downwards as it progressively takes damage, so you will need to find a way to shoot the monster, abiet not take any/very minimal damage yourself. You have 4 lives, with three hearts. Each time you get hit, the screen will display "ARRGH! IT'S STICKY!" and you will lose a heart. If you lose all of your lives, the game is over. If you win, the monster will die, and you spaceman will fly off.