Commander Keen — Sega Master System port

A port of HTML5-Keen (a melonJS Commander Keen 1 demake) to the Sega Master System, built with devkitSMS / SDCC / SMSlib.

keen.sms is a 144 KB SEGA-mapper ROM. It runs the full game loop of the original JS version: title screen → Mars overworld → three platform levels → win screen.

Github repo: https://github.com/haroldo-ok/ck1-sms

Controls

D-pad
Walk / steer (4-way on the overworld)
Jump / enter level
Fire the raygun
Mount / dismount the pogo stick

Collect the pogo stick / keycards in the levels, bounce on a yorp's head to stun it, shoot it to stop it for good. Walk into the exit door to clear a level; clear all three to win. The rock gate east of the first city opens once level 1 is beaten, unlocking the rest of the map (the level-block object from the original's TMX data — its collision handling was commented out in the JS, which made the blocker decorative; here it works as the classic Keen progression gate).