Super Multi-play
From Sega Retro
The Super Multi-play is a third-party multitap manufactured by Performance for use with the Sega Mega Drive. It was only released in the US.
The Super Multi-play is built similarly to Sega's own Team Player adapter (the original version), but features a switch allowing it to play games developed for use with the 4 Way Play. Because these two peripherals work in different ways, the Super Multi-play actually as three leads which can be plugged into the Mega Drive. One lead is dedicated to games compatible with the Team Player while another is compatible with 4 Way Play games. It can also allow up to five players to play at once, assuming another controller is inserted into the Mega Drive's first controller port.
Unlike the Team Player, the Super Multi-play does not allow you to manually select how many controllers are plugged in, and therefore always gives the signal all four controller ports are occupied even if they aren't. This doesn't usually affect gameplay, however.
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