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Space Dungeon is a shoot 'em up arcade game created by Taito Corporation in 1981. It was designed and programmed by Rex Battenberg. It was released both as a conversion kit and as a full arcade cabinet. The only home version of the game was released in 1983 for the Atari 5200 game system.
Like Robotron: 2084 and Smash TV, the uncoventional controls for Space Dungeon are a pair of 8-directional joysticks (one for moving, one for shooting) rather than the more typical single joystick and fire button. This mechanism allows plays to shoot in directions other than that in which they are moving.
Each level of Space Dungeon consists of 36 rooms arranged in a six-by-six grid. Rooms are connected by open doorways of various sizes. One room in each level is the entrance, where the player begins, and another is the "Collect Bonus" room. Other rooms may or may not contain laser defenses, hostile aliens, or various bits of treasure.
The goal in each level is to navigate to the room containing the "Collect Bonus" area, visiting as many rooms and collecting as much treasure as possible along the way.
The player's only weapon is a laser cannon, which fires a pulsing, solid beam in any of eight directions.
Treasure is collected by flying directly over it. When this happens, a distinct sound signals the treasure has been automatically scooped up into the player's inventory, called the Treasure Box.
Higher scores are awarded for exiting each level with more treasures. A 10,000-point bonus is awarded if the player visits every single room on the level, whether or not all treasures on the level have been collected. Since an extra ship is awarded to the player every 10,000 points, this, and the large point values of the treasures (especially the later ones) created an interesting tension between securing the treasures already collected or risking losing ships to acquire more.
If the player's ship collides with an enemy or any of their spore shots before reaching the "Collect Bonus" cube, all collected treasure is dropped in the room where the ship was destroyed. This room is designated on the map by an "X".
The game counts from level 1 to 99, and upon completing 99, rolls over to zero.
Levels two through nine, and then levels that are a multiple of one hundred, are preceded by a rhyme:
- The Thief's in view on level 2
- More to see on level 3
- Watch each door on level 4
- Stay alive on level 5
- Watch for tricks on level 6
- It's not heaven on level 7
- Meet they fate on level 8
- You're doing fine on level 9
On reaching level 10, the game then displays "Sorry. No more rhymes." No further messages appear until the player rolls-over the level counter by completing level 99. At level 100, the level counter resets to zero, and the message displayed is "You're a hero on level zero." Thus this same "level zero" message will be repeated every hundredth level.
The enemies the player must face throughout the game are:
- Piker (100 points). Slow-moving, spiked ships that attempt to collide with the player's ship. The player's laser must hit the core of a Piker to destroy it. Shooting of its spikes [confusingly called a "Piker (shield)"] awards 10 points each. If a Piker is left with its core intact, even if some of its spikes have been destroyed, then the entire Piker will be restored if the player leaves the room and returns.
- Corner Zapper (25 points). These always appears in sets of four, one in each corner of the room. They fire beams randomly and intermittently between different pairs, and the player's ship is destroyed if it gets caught in the crossfire. If any Corner Zappers are left intact when the player exit a room, all will spontaneously regenerate upon the player's return to that room.
- Deathsquare (25 points). Slow-moving obstacles. A single shot will destroy them.
- Guard (125 points). These red creatures tend to be found near treasure items, and mimic the player's movements, though at a slower speed, while shooting spores at the player.
- Executioner (125 points). These creates actively chase the player, firing spores and attempting to collide with the player's ship.
- Enforcer (250 points). These enemies, looking vaguely like a smiley face, will materialize in a room and charge at the player. It takes several shots to destroy an Enforcer, making it a high-priority target. If the player moves into another room with an Enforcer on the screen, the Enforcer will appear in the new room at the same location, and resume its charge.
- Spore Case (500 points). Spore cases neither shoot at the player nor move toward him, but if the player shoots one, it will spit out three spores, often in the direction of the player's ship. Spore Cases appear spontaneously after a short delay in all rooms, with more Spore Cases appearing over time, up to a total of four. Spore Cases first appear on level 3.
- Thief (50 points). The Thief moves around the dungeon autonomously and picks up treasure, but the player cannot kill him. When the player shoots him, he drops any treasure that he might be carrying and changes directions. He may also leave behind Guards if shot multiple times. The Thief first appears on level 2.
There are five treasure types in the game:
- Iron Cross (500 points). Appears as a red cross.
- Copper Piece (1000 points). Appears as a red barbell.
- Silver Star (2000 points). Appears as a white star.
- Golden Fleece (4000 points). Appears as a white circle with a glowing middle. First appears on level 4.
- Platinum Ark (8000 points). Appears as a glowing circle with a white "I" in the middle. First appears on level 6.
The only home version of Space Dungeon appears to have been for the Atari 5200 system, and was released in 1983. The game cartridge came prepackaged with a dual-controller holder, allowing players to snap two stock controllers in and play like in the arcade.
The game differs from the arcade original in a number of ways, most notably in that most of the objects are approximately four times the size, spores can be launched by enemies only in the eight ordinal directions, and the enemies are considerably less aggressive.