Invade-a-Load was a typical "turbo tape" loader, with one notable feature: While the actual game was loading - a process which usually took a long time, even with optimized loader routines - the loader allowed the user to play a smaller game to pass time. The game was a clone of the famous Space Invaders game. The minigame was loaded in under a minute, providing entertainment while waiting for the actual game to load which could take a further five to ten minutes.
The loader itself has a copyright date of 1987, but the first games that used the loader showed up in 1988. Over the following years, Mastertronic used the loader in dozens of titles.
In 1995, Yoichi Hayashi of Namco Ltd. invented a variant of this technique for use with optical disc based platforms such as PlayStation and applied for a patent. was granted in February 1998 and assigned to Namco.