Isyium is a unique combination of simulation, strategy and casual arcade (if played in that spirit) with an abridged story mode.

Set in an orbital accelerator many years in the future after Earth's untimely bio destruction, you pilot a futuristic - if not altogether rusted and clunky apparatus - called the Spinnercast Module, capable of near light speed as it races through the loop. Your goal is to create Isyium - a theoretical particle that reverses the effects of Proxectron - the cause of Earth's disaster. (Proxectron was similarly created in an orbital accelerator).

Discovering a casebook detailing the process of defining Isyium, you now run something called a simulant, building particles and logging codes. When eight codes have been defined there is a brief puzzle to solve before uploading them, completing your mission.