Play Karous Online Free for Sega NAOMI.
That clip up top is the real Karous — the actual 2006 Sega NAOMI game from Milestone. Grab the free RetroPlayers.Club Player and it runs full-speed on your PC, no cartridge required.
Karous
Play this Game The Right Way Now -> Download Our Mini App & Start PlayingThe RetroPlayers.Club Player is a Premium perk. Go Premium or sign in to play Karous at full speed on your own PC.
Karous can be relived on your own PC through the free RetroPlayers.Club Player app — full speed, with a controller and saves just like your hardware. You confirm you own the game from your library, and no need to connect your console.
🎮 USB or Bluetooth controller? Plug it in, Once Detected Click Here to Open Your Controller Options
| Action | Keyboard | Controller |
|---|---|---|
| D-Pad Up | ↑ | D-Pad up |
| D-Pad Down | ↓ | D-Pad down |
| D-Pad Left | ← | D-Pad left |
| D-Pad Right | → | D-Pad right |
| B (bottom) | X | Bottom face |
| A (right) | Z | Right face |
| Y (left) | S | Left face |
| X (top) | A | Top face |
| L | Q | Left shoulder |
| R | E | Right shoulder |
| Start | Enter | Start |
| Select | V | Select |
🎮 Sega NAOMI controls
These are the keys the RetroPlayers.Club Player app uses for Sega NAOMI, shown for reference. Your controller still lights up below so you can confirm it is detected — Premium members can remap here (keyboard or USB controller) and the app applies the map at the next launch.
No controller detected yet — plug one in and press any button.
Press buttons — your controller lights up here so you can see it is detected. Go Premium to save a custom map.
| Action | Keyboard | Controller |
|---|---|---|
| Lever Up | W | D-Pad up |
| Lever Down | S | D-Pad down |
| Lever Left | A | D-Pad left |
| Lever Right | D | D-Pad right |
| Shot | J | Top face |
| Sword | K | Left face |
| Shield | L | Left trigger |
| Start | Enter | Start |
Report this game not working
First registered run claims the top spot. It won't stay easy for long.
Playing counts once you're signed in — register free in the player above.
Karous is a vertical-scrolling shooter video game developed by MileStone Inc. for the Sega NAOMI platform and released in Japanese arcades on November 15, 2006. The game was later ported to the Sega Dreamcast, becoming the system's last officially licensed title when it was released in Japan on March 8, 2007.
How to Play Karous
Once Karous is running in the app, these are the default controls — every one of them is remappable from the Controller Mapping panel.
The Story Behind Karous
Milestone released Karous for the Sega NAOMI in 2006.
This collection was released in the United States in February 2009 by UFO Interactive Games under the name Ultimate Shooting Collection. This version was later released worldwide for Microsoft Windows on Steam on January 22, 2026. Karous (カラス, karasu, "crows") is a vertical-scrolling shooter video game developed by MileStone Inc. Ports of the game to PlayStation 4, PlayStation 5, and Nintendo Switch were released on November 27, 2025, exclusively in Japan.
The collection includes both Radirgy and Chaos Field as extras.
What You'll Play
Karous is a shoot 'em up game for 1 player, played full-speed in the free RetroPlayers.Club Player with its Controller Mapping panel.
When a bomb is activated, a barrier surrounds the player, which can damage enemies within the barrier. For the duration of bomb activation, the player is invulnerable. Enemies destroyed by the barrier provide more experience points to the player.
The player's shot, sword, shield can be upgraded by using experience items dropped from enemies, with a maximum of 100 levels.
Background sources: Wikipedia.
Karous — Frequently Asked Questions
Do I need to download anything to play Karous?
Yes — Sega NAOMI games run in the RetroPlayers.Club Player desktop app, a quick free download. The video on this page is real Karous gameplay so you know exactly what you are getting before you install.
Can I remap the controls in Karous?
Absolutely. Inside the app, Controller Mapping lets you change every Karous binding to whatever keyboard keys or pad buttons you prefer.
Who developed Karous?
Karous was developed by Milestone and published by Milestone.
How do I play Karous?
Grab the free RetroPlayers.Club Player linked on this page and launch Karous in it. It plays the genuine Sega NAOMI game natively on your computer; the clip above is a live preview.
This Game is Also Known As: “karous game”, “karous online”, “play karous free”, “karous tournament”, “karous play online”