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SNES OffsetTypeGameLengthDescription
$70:0002FlagHall screen2 bytesHas constant value #$9743.

This address, along with that of $70:1FFC are used to ensure that the SRAM battery data has not been corrupted.

Typical battery corruption can be caused by an electrical surge or magnetic flux. Either of these can flip a selection bits on either side of the battery (if not the whole battery) to either all 0 or all 1. Thus these values are both arbitrary, but designed to have a seemingly random scattering of 1s and 0s.
$70:1FF0PointersHall screen1 byteGame-play video to show.
$00 = SMB1
$01 = SMB:TLL
$02 = SMB2
$03 = SMB3
$70:1FF2FlagHall screen1 byte$01 if we are doing the game-play example, otherwise $00.
$70:1FFCFlagHall screen2 bytesHas constant value #$5321.

This address, along with that of $70:0002 are used to ensure that the SRAM battery data has not been corrupted.

Typical battery corruption can be caused by an electrical surge or magnetic flux. Either of these can flip a selection bits on either side of the battery (if not the whole battery) to either all 0 or all 1. Thus these values are both arbitrary, but designed to have a seemingly random scattering of 1s and 0s.