Overview
Capture the Flag is a 3D first-person perspective, two player, video game, released for the Atari 8-bit family and VIC-20 by Sirius Software in 1983. It was written by Paul Allen Edelstein as the follow-up to his 1982 game, Wayout, which has similar maze-based gameplay for one player. Along with its predecessor, Capture the Flag was among the first 3D maze games to offer the player full 360 degree movement, and one of the earliest multiplayer games from a first-person perspective within a 3D rendered environment.
Gameplay
Capture the Flag is essentially a two player version of Wayout, with one player (the "Invader") trying to find the exit (or 'flag') in the maze while the other player (the 'Defender') tries to stop them, a role similar to the computer-controlled "Cleptangle" from the first game. The main difference is that the game's display is split-screen, allowing each of the two players to view the maze from their own perspective. In the single-player version, the computer takes the role of the defender.
Each player is represented within the maze as a simple, rectangular-shaped, blue or green avatar. If the Invader finds the flag, or the Defender catches the Invader, a new maze is generated and the chase starts again. Another progression from Wayout is that instead of a finite number of mazes, Capture the Flag can create an infinite number of randomly generated mazes.
From Wikipedia (CC BY-SA 4.0).