Johan Koelman

1 Karat

Sinclair ZX-81 - Homebrew - July 25, 2019

1 Karat is a Bejeweled clone for the Sinclair ZX-81. it was developed by Dutch coder Johan "DR. BEEP" Koelman and released by YRS on July 25, 2019. Due to the fact that there is no color, the player has to match by patterns instead.

1 Line 3D Mazes

Sinclair ZX Spectrum - Homebrew - 2008

1 Line 3D Mazes is an old school pseudo 3D maze game using pseudo vector graphics for the Sinclair ZX Spectrum coded in a single line of BASIC code. It was developed by Einar Saukas, Digital Prawn, and Johnan "Dr . BEEP" Koelman and released into the public domain in 2008. The game consists of three different mazes/modes.

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