crater review
A focused Game Gear emulator for macOS and Linux development workflows.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
crater is an open-source Sega Game Gear emulator written in C, aimed at developers and enthusiasts working on macOS or Linux. Alongside emulation, it includes a Z80 assembler for creating ROM images and a Z80 disassembler for examining ROM code. ROMs can be detected from a directory or loaded directly by path, while keyboard and SDL controller input support different play styles. Display options include fullscreen and scalable windowed modes with integer scaling.
Its strongest distinction is the combination of emulation and low-level development tooling. Emulator logging and trace output provide additional visibility into execution, while the assembler and disassembler support ROM creation and inspection within the same project. Battery-backed cartridge save files preserve game progress, but crater does not provide save states or an advanced Game Gear debugger. That makes its feature depth more relevant to development and technical exploration than to users seeking a broad convenience-focused emulator.
The published model is open source and free, with local operation on macOS and Linux. The platform scope is the main practical constraint: users on other operating systems should choose an emulator with broader platform coverage. crater is a strong fit for Game Gear development, ROM analysis, and users who value Z80 tools, logging, and trace output. It is less suitable for players who depend on save states, advanced debugging, or support beyond macOS and Linux.
crater pros and cons
- Where it wins
- Includes Z80 assembler and disassembler tools
- Supports keyboard, SDL controllers, fullscreen, and integer scaling
- Provides battery saves, logging, and trace output
- Where it doesn't
- Runs only on macOS and Linux
- Does not support save states
- Does not include an advanced Game Gear debugger
crater fact sheet, pricing and score →
Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.
Last updated · How we research and update