B.A.T. II - The Koshan Conspiracy - Walkthrough Part 7 - Koshan and Ending

Walkthrough Part 7: Get Ditroxyl from the chemist in Northern Sector Go to Koshan Tower Turn off switch in room to the right Solve door puzzle: A time is counting down after you go through the first door. On the door puzzle pick a combination that is quick to solve and wait for it to come up. If your choice hasn't come up with in the time limit go outside and back in to reset the timer. All done. A big thanks to Tornado on The Adventure Gamer blog for working out there is a timer after you go into Koshan Tower.
B.A.T. II - The Koshan Conspiracy Developed by Computer's Dream Released 1992 Published by Ubi Soft Entertainment Software B.A.T. II – The Koshan Conspiracy is a futuristic point and click adventure game written by Computer's Dream and published by Ubi Soft in 1992. It is the sequel to the 1990 game B.A.T. (Bureau of Astral Troubleshooters). It is a futuristic role-playing game in which the player explores a city, talks to non-player characters, tries to solve puzzles and complete quests, travels to new cities by use of a driving or flying mini-game, buys supplies, food, weapons and ammo, engages in fire fights (also by way of a mini-game), and enters space. The player can program a wrist computer (B.O.B) in the game to perform different functions. It has a very open, non-linear play style. BAT 2 - The Koshan Conspiracy is available to play by stream on the Internet Archive: