Shanghai is a strategy game that has appeared on many platforms, and quite a few Japanese arcade games. It is based on the oriental tile game Mah Jong, and is very addictive. New versions for current mainstream platforms are still being made today. The object of the game is to pull off matching tiles until the entire screen is emptied. You can only pull off from the left or the right, and only if the tile is not blocked in on those two sides. You also can not pull tiles that have other tiles on top of them.
The original cartridge version was later ported to OS-9 by Bill Nobel. A little later after that, Alan Dekok did some further modifications to the OS-9 version, allowing for different tile sets.
One interesting bit of trivia from the original cartridge game: there is a hidden, 3rd color set (besides the labelled RGB and Composite), which is a yellow shadow based color set. You have to select it from the main game screen, and it is in the upper left 1/4 of the screen.. in only ONE spot. See if you can find it, if you have the cartridge version!
Title: Shanghai
Author: Rick Adams (Activision) (cartridge original), and Bill Nobel/Alan Dekok (OS-9 version)
Publisher: Radio Shack/Tandy
Released: 1987
Requires: Color Computer 3, 128K RAM, cartridge, joystick (Radio Shack version), or 256K RAM, disk, joystick optional (OS-9/NitrOS9 version).