I have a few games listed in ebay, most of them for the +3, all of them work:
Cabal for +3 only disk
https://www.ebay.es/itm/112822768367?ss ... 1555.l2649
Dr Dooms Revvenge for +3 only disk
https://www.ebay.es/itm/112823381603?ss ... 1555.l2649
Night Hunter for +3 only disk
https://www.ebay.es/itm/112833900252?ss ... 1555.l2649
Navy Moves complete small case release
https://www.ebay.es/itm/112822501214?ss ... 1555.l2649
Scramble Spirits for +3 only disk
https://www.ebay.es/itm/112823354344?ss ... 1555.l2649