ftp.nice.ch/pub/next/games/strategic/Quinto.NIHS.bs.tar.gz#/Quinto/Description.txt

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Quinto Version 1.0 by Edmund Ronald 
Quinto is a game. The board is a 5x5 array of buttons, pressing 
one toggles its' state and that of  its 4 neighbors.
The aim of the game is to highlight all the buttons.
Includes source code
Intel binaries

These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.