This game is a Commodore 64 port developed by KWayne, based on the original version created by Hiroshi Suzuki for the Commodore PET in 1979. Widely recognized as the first stealth game in history, it captured KWayne’s attention after he discovered it through a video by Robin from the 8-bit Show and Tell YouTube channel. Intrigued by the fact that a C64 port did not exist, KWayne took on the challenge of recreating the game for the Commodore 64.
You can get a copy for yourselves via KWayne’s Manbiki Shounen page.