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Harmful Park

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Title Screen

Harmful Park

Developer: Sky Think System
Publisher: Sky Think System
Platform: PlayStation
Released in JP: February 14, 1997


DevTextIcon.png This game has hidden development-related text.
LevelSelectIcon.png This game has a hidden level select.


Harmful Park is known for being a rather cute and charming shmup, with loads of weird gimmicks and unique gameplay mechanics. It's also known for being one of the hardest titles to find for the PlayStation, though it can be found on the PlayStation Store thankfully.

Test Mode

Harmful Park Test Mode.png

Highlight Exit in the options menu. Then press, R1, R2, L1, L2, R1, L2, followed by Circle to access a Test Mode menu. Here, the player can go to any level, see any intermission and the ending, and view the bonus illustrations when completing a level perfectly.


(Source: Shingata Kururinpa)

Dev Text

The game's main executable, HARMFUL.EXE, has some small debug HUDs present at 0x1368 and 0x2780.

        D OBJ= %d
         O OBJ=%d
          PRIM=%d
DOBJ STS[%d] = %d
OOBJ STS[%d] = %d
PRIM STS[%d] = %d
SEQG=%d
 SEQ=%d
SPRG=%d
 SPR=%d