Megagames
Imagine had intended to develop six so-called "Megagames", the most well-known of which were Psyclapse and Bandersnatch. These games were designed to push the boundaries of the hardware of the time, even to the extent that they were intended to be released with a hardware add-on which would have increased the capabilities of the computer, as well as guarding against piracy. The games were advertised heavily and would have retailed at around £30 - an expensive price tag when the average price of a game at the time was £7.20 - but Imagine's collapse meant that they remained vaporware and never saw the light of day.
Read more about this topic: Imagine Software