Sonic Eraser (ソニックイレイザー?) is a video game in the Sonic the Hedgehog series that was available to owners of the Sega Game Toshokan on the Sega Mega Modem with a Sega Meganet subscription. All the three aforementioned enhancements for the Sega Mega Drive were exclusively released in Japan. The game required users to have either Windows 98se, Windows Me, Windows 2000, or Windows XP. With a 1-megabit per second internet connection, the game only took about a minute to download.
Due to the Sega Meganet expansion never reaching worldwide availability, Sonic Eraser was a virtually unknown game, with only a minimum amount of downloads made during the operation of service. In February 2004, a website called "Sonic CulT" earned a portion of the ROM through Sega's Japan-only downloading service and documented the game online
The game was later made available on Sega's B-Club download service in Japan.
Sonic Eraser is a simple puzzle game. In the versus mode, when a player gets a combination of three consecutive lineups of pieces, that player's Sonic attacks the other player's Sonic, causing them to momentarily loses control of their pieces.
The game offers four unique modes of gameplay, all playable by either one or two players:
- Round Mode (ラウンドモード?): This is the standard puzzle mode of Sonic Eraser, consisting of 40 stages. Each stage has a bunch of spiral ring shapes interspersed with other normal shapes. Just like the other shapes, the spirals disappear when paired. The objective is to clear them all from the play field by eliminating the shapes between them. The time limit is three minutes for each round, but pausing the game does not stop the clock so the player is recommended to go before starting. If the player has blown the round, such as being stuck with only one spiral left, pressing + will end the round.
- Normal Mode (ノーマルモード?): This is the standard low-pressure game, allowing the player to play for points as long as they would like. The better the player performs, the higher the level will rise. As the player climbs the ladder, the speed at which clusters fall will increase.
- Doubt Mode (ダウトモード?): The rules are normal except that white squares will never fall. Instead, a single shape from almost every cluster will turn into a white square when it hits the ground. These are called "lie blocks".
- Block Mode (ブロックモード?): This mode has clusters that stand on-end, being able to stack up as high as the player dares for massive chain reactions. It only takes a single pair to send the whole tower tumbling.
- Produce: Takao Miyoshi ("Taka Oh")
- Program: Op #1
- Design: Shirō Kinemura ("Rouly")
- Music: Masaru Setsumaru ("Bosanova Oyz")
- Special Thanks : Naoto Ohshima ("BigIsland"), Osamu Hori ("Osamu"), Noisy Pad, Chie Yoshida ("Chiesama"), Iiyo
- Sonic Eraser was the first Sonic-themed puzzle game, with the second being Dr. Robotnik's Mean Bean Machine.
- This game was originally meant to be in Sonic Gems Collection, as evident by a deleted reference in the game's files.
- ソニックイレイザー (Japanese). Sega Game Honpo. Archived from the original on 6 March 2004. Retrieved on 24 February 2022.
- 動作環境／ご利用前の注意 (Japanese). Sega Game Honpo. Archived from the original on 6 March 2004. Retrieved on 24 February 2022.
- Sewart, Greg (26 September 2016). Game Toshokan. Sega Does. Retrieved on 10 June 2018.
- Santa Maria, Alex (3 November 2015). Sega Meganet: Yesterday’s Digital Distribution Future. Techraptor. Retrieved on 10 June 2018.
- Sonic Eraser. Sonic CulT (2004). Archived from the original on 26 February 2004.
- Sonic Gems Collection (Nintendo GameCube) Action Replay code: 021CCD5B 00003139. Media:Sonic Eraser.png.