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Other Lemmings Projects => Other Projects => Topic started by: Squidgy on May 01, 2026, 04:12:28 AM

Title: Level Editor for the Sega Master System
Post by: Squidgy on May 01, 2026, 04:12:28 AM
Hey folks, it must've been a good decade or more since I last posted here!

I've made a Level Editor for the Sega Master System version of Lemmings: https://lemmingseditor.trainersquidgy.com/

I want to say a big thank you to Pooty for laying the groundwork 15 years ago with this one, I absolutely wouldn't have been able to do it without the incredibly solid foundation!

I've tried to make it as intuitive to use as possible, although I'm sure there'll be a bunch of bugs still in the system.

The basic info is as follows:
- When you first open the editor, you are asked to provide a username, this links you to a personal key. Keep it safe, this is the way you access your levels. No user information barring the username is logged on the server.
- Once you have your key, you will be presented with the editor itself. The editor and subsequent patch are designed around the modded version of Lemmings that I'm using for the Genesis Level conversion, so there are 240 level slots, an expanded tileset, and quality of life features such as pressing 1+2 and then left/right on the D-Pad to scroll between skills, release rate can be increased and decreated and the ability to search through the levels from the level info screen.
- You can browse and edit/replace all the levels.
- You can paint individual tiles, fill areas, create and use brushes (some very janky ones are in by default) and select to clone/move/delete areas of a level.
- You can export any edited levels as .MLM files if you wish to use them in a more vanilla ROM, or you can directly build an IPS patch within the level editor. There's also an option to verify that you own the original Master System version of Lemmings to use the in-built patcher within the level editor.
- There's full support for traps, variable splat distance, and setting a specific music track per level.
- You can share your levels with others in the community, and play others' levels by downloading them into your game.

If anything breaks or you've spotted a feature that could be helpful, feel free to give me a nudge and I'll see what I can do!

SMS-Level-Editor-1.png
SMS-Level-Editor-2.png
SMS-Level-Editor-3.png