Glitch: Saving with Spider Ball
As you may know, the game doesn't let you save while you are using Spider Ball. However, for a very brief frame at the edges of the save platform, the game will actually allow you to save while using Spider Ball.
Jump onto the platform, ball up and activate Spider Ball, then roll off one end of the save platform, and if you are sharp enough, you may see the "Press Start to Save" message at the bottom of the screen while doing this.
If you can move yourself so that the message remains at the bottom of the screen while using Spider Ball, you can save with it actiavted.
We have more cheats and tips for this game here, Metroid II: Return of Samus cheats
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