sonichedgeblog:

A comparison of the Sonic 2′s Underground Zone boss across Game Gear & Master System. 

Those who could only play the Game Gear version would tell you this boss is extremely hard due to the cramped play space and the ball randomly changing speed and height.

Those in Europe who were able to play it on the Master System would note that this the easiest boss in the game, as the ball does not change speed or height.

[Sonic
The Hedgeblog]

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I only ever played the Game Gear version bc that was the one that was included with Sonic Adventure DX, and this boss was why I never rly played the rest of the game. I might have gotten past it once at very most