Z-Tack was an Atari game in which you tried to save the Earth from aliens who were hiding in underground caverns. I found this game initially a bit boring but when I couldn’t hit any aliens and kept getting killed every few seconds, I was up for the challenge. I’m actually a big fan of this game now. It’s really tough and hard to stop playing. There are around 6 levels that cycle through over and over getting tougher and tougher each time – as if the first screen wasn’t tough enough!
It’s a really small game too at 528 KB!