biggoil

Fast action game for 16K ZX81.

Pure machine code action FTW.

• Collect the oil from the underground tunnels.
• Do not let the enemies touch the pipe that you pull along behind you.
• Enemies self-destruct upon contact with the drill head.

Default controls:

UDLR / FIRE
QAOP / SPACE

Redefine keys on title screen.

DOWNLOAD

Enhanced features:

• Music and sound effects.
  • ZonX compatible AY chip is required, E.G. Mr.X, ZXpand+, ZXPand+AY
• Joystick control
  • ZXpand+, ZXpand+AY standard.

All game and artifact handling code by Sir Morris Bigg.
STC music player by Andy Rea.

Sketchy

AYFXEdit

BRASS

Archived development log

---

bugs:

• ~~pipe turns are broken after retracting~~
• ~~enemies crossing leave an enemy character behind~~
• ~~'hello' sound too loud~~
• ~~invalid entrances can be selected~~
• ~~enemies erase non-solid inverse characters~~

engine

• rom dependency removal via custom irq handler
• ~~non-interruptable SFX~~
• ~~fix race condition potentials~~
• ~~make 'map' of the level at the start~~
  • ~~either 0 for passable (dot, space) or 128 for impassable~~
  • ~~player fills map with grey~~
  • ~~enemies unplot themselves using map data (no more lost dots, crashing through scenery)~~

features:

• ~~difficulty ramp~~
  • ~~enemy spawn rate increases every level~~
  • ~~enemy speed~~
• pick-ups
  • slow enemies
  • stop enemies
  • nuke enemies
  • poison
• ~~timer~~
• ~~enemy animations~~
• ~~sound~~
• ~~extra lives~~
• different enemy types
• character animation tables (and hence UDG possibility) for:
  • ~~boring head~~
  • ~~enemies~~
• ~~title screen~~
• ~~game over screen~~
• ~~control customisation~~
• music:
  • level begin jingle
  • level complete jingle
  • ~~title screen~~
  • ~~game over screen~~

whimsy

• ~~cloud animation~~
• ~~lorry animation~~
• message?

enemy behaviour

• ~~turn around when obstructed~~

If you're reading this well done! The ZX81 scene is dead. Long live the ZX81 scene.