The player controls BLOB, whose mission is to penetrate the unstable core of a rogue planet which has appeared from a black hole. If the core is not repaired within the set time limit it will implode causing a chain reaction which will destroy the entire universe. The planet is inhabited by various primitive creatures, all hazardous to the touch, and the remnants of a previous civilisation which provides the items needed to rebuild and stabilise the planet core.
Gameplay
Within the game, there are multiple ways to get around:
Running is the default.
Hover platforms can be used to fly. Items that BLOB can carry cannot be picked up while on a hover platform.
BLOB can build his own short-lived platforms to reach high places.
BLOB can get through some trap like doors by making short-lived platforms then dropping onto them when they will disappear.
There are some tube shaped lifts which will lift BLOB upwards to the top. BLOB cannot enter these whilst on a hover platform.
There are also multiple teleport booths scattered around the play area, each with its own destination code.
BLOB is able to carry up to four items at once, using a FIFO arrangement. Some of the items encountered will be useful to repair the core, while others will need to be exchanged using a Cheops Pyramid for something more useful. There is an Access credit card, which can fill in for any of the numbered chips needed to get through security doors, and for using the aforementioned Pyramid. There is also a Key which can be used to open doors. As well as items needed to repair the core, the Access card and Key, there are items which will top up BLOB's energy, his platform building capacity or his firepower. There is one cylinder like object which will top up whichever level is lowest, and even add a life if BLOB is down to his last. BLOB can also top up his lives by moving into joysticks which are an extra life. Points are scored for shooting the various moving hazardous creatures, worth between 80 and 320 points each, and 10,000 points per core item replaced. 250 points are scored for each time BLOB enters a new screen. There are also other hazards, dangerous spikes and energy fields that will kill BLOB on contact, as will the mines that move around like the creatures. The game features play area of 512 screens. The placement of the objects, and the identities of those needed to fix the core are randomized at the start of the game, the map/screens including locations of teleport booths remain fixed as do their destination codes. There are nine core elements to replace in order to complete the game.
Reception
The ZX Spectrum version was ranked 27th in the Your Sinclair Official Top 100 Games of All Time and 10th in Retro Gamer magazine's "Top 25:Spectrum Games".
