Millionaire is a business simulation game originally written for the ZX Spectrum by John Hunt and ported to the Acorn Electron and BBC Micro.

Starting with an investment of £500, the player uses this money to pay advertisers and cover tape duplication costs.

A character called Honest Harry who can offer deals such as cheap cassettes, which will lessen distribution costs, or programs.

Progress in the game is monitored by observing the sales figures at the end of each month.

Chance plays a role; certain events will affect sales positively or negatively.