Looking at the screenshots, you'd swear that Collision Course was a VCS game. I mean, everything is blocky and details are sparse. And you'll even notice a flicker here and there despite hardly any objects littering the playfield. Anyways, the basic motif here is a warmed-over Defender that's poorly done. Your job is to protect a trio of cargo ships returning home from a five-year mining expedition. All four of you are heading through a particularly dangerous part of the galaxy that seems to be lined with floating mines and killer satellites. Your escort cruiser comes with guns to nail the mines and satellites as well as a shield to protect you from them -- but the shield time is very limited (about six direct hits will do you in.) You're up against a time limit for completing your mission, and you must complete it -- you've got to make sure that those cargo ships make it home.
There are four different skill levels, and the game contains four different types of mines. There's also smart mines that try and chase you, and accelerator/decelerator "beacons" that speed up or slow down your convoy whenever you hit them.
You have only a very short amount of time to get through all the mine fields. And regardless of how slow and gingerly you make your way through space, you can count on losing just about all of the cargo ships -- they're big and dumb targets that are begging to be destroyed. But don't worry about it because you only have to get one ship home to win a round, and there's a very large bonus for getting another one through.
With gameplay that's basically been castrated of excitement and graphics that even your average two-year-old can draw with a crayon, it's hard to figure out why Collision Course requires a hefty 24K of memory to play it. It was sure was nice knowing you Zimag... NOT!