Manic Miner is the world's coolest platform game, pride of the Speccy. It's well worth digging out the dead flesh keyboard for this one (or find it on an emulator near you).

The levels are

  1. Central Cavern (6)
  2. Cold Room (61) Do the penguins indicate a taste for GNU/Linux?
  3. The Menagerie (62)
  4. Abandoned Uranium Workings (621)
  5. Eugene's Lair (63) Yup, those are toilets alright.
  6. Processing Plant (136)
  7. The Vat (632)
  8. Miner Willy Meets The Kong Beast (6321) Go on give him a dip.
  9. Wacky Amoebatrons (64)
  10. The Endorian Forest (641)
  11. Attack Of The Mutant Telephones (642) The telephones are beautiful.
  12. Return Of The Alien Kong Beast (6421)
  13. Ore Refinery (643)
  14. Skylab Landing Bay (6431)
  15. The Bank (6432)
  16. The Sixteenth Cavern (12346)
  17. The Warehouse (65)
  18. Amoebatrons Revenge (651)
  19. Solar Power Generator (652) This one is quite tricky.
  20. The Final Barrier (1256)

The numbers in parentheses are cheat codes but you don't need those do you? Just in case you do, start up the game as usual and then type in the programmer's old telephone number 6031769. Then the above codes (hold down the keys simultaneously and then release) will allow you to jump to any level.

The eponymous hero, Miner Willy, looked a bit like this:

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