Digger

Digger is one of the first truly addictive arcade games to reach IBM personal computers, and for an entire generation of users it was the very first reason to stay at the office machine after work hours. The player controls a small digger that tunnels through the dirt of an underground mine, collecting emeralds and bags of gold while dodging monsters that come rushing through its own tunnels. The basic tactic is to dig under a bag of gold so it drops onto an enemy's head, or to sweep up every gem in a single pass for a bonus. There's also a limited ability to fire a shot, but reloading takes a long time, so survival mostly comes down to smart tunnel planning.

Technically, it's a showcase of what could be squeezed out of a CGA card. Four colors, chunky blocks of dirt, and simple monster icons are enough to make a perfectly readable game where the player always knows exactly where the danger is coming from. Movement is smooth and fast, which was far from a given on the hardware of the time. Sound comes from the internal PC speaker, and yet the game dared to run a continuous electronic jingle that became just as much its trademark as the digger itself. The combination of beeping, digging, and sudden silence after losing a life is one of the most distinctive sound memories of the PC XT era.

The game owes its longevity to the fact that it later spread freely and gained newer versions capable of running on more modern machines, including variants with custom levels. Genre-wise it follows in the footsteps of mining arcade games from the arcade cabinets, but its emphasis on building your own network of tunnels gives it its own identity. Today it feels like pure classic gaming: the rules explain themselves in two sentences, a single round lasts a few minutes, and the difficulty ramps up exactly fast enough to keep the player believing they'll do better next time. That very simplicity is why people still come back to it four decades on.