April Fools events
Like most music games, SEGA's music games also have April Fools events each year around April 1st.
In 2020, due to w:COVID-19, April Fools events for all games were postponed to mid-June.
maimai
- 2013: セガサターン起動音 (NOT [H.][Remix]), playable on development cabs in SEGA only
- 2014: Site changed to "The world of three kingdoms"; 犬日和。 sung by はっぴー (4/1 only) [1]
- Revived in 2019 as 犬日和。(はっぴー歌唱Ver)
- 2015: 全世界共通リズム感テスト (4/1~4/7) [2]
- Expert and Master charts revived in 2019
- 2016: Wonderland Wars オープニング (4/1~4/7) [3]
- Revived in 2019
- 2017: Garakuta Doll Play ガラクタ総選挙, 犬日和。 宴 星 (3/31~4/6) [4]
- GDP No.1 and 犬日和。 revived on 2017/06/22 (MURASAKi+ release date)
- GDP No.2~No.5 Revived in 2019
- 2018: 疾走あんさんぶる 宴 協, ミラクル・ショッピング 宴 蛸 (4/1~4/8) [5]
- Playable normally since 2018/05/08
- 2019: 怒槌～光吉猛修一部謎～ 宴 宴 plus aforementioned revivals as 宴 attribute charts (4/1~) [6] [7]
- 怒槌～光吉猛修一部謎～ is part of a cross-game event called AnotherVisionへの挑戦, a collaboration with the university students' creator group w:ja:AnotherVision. Charts in all 3 games, as well as the background video in maimai, contain puzzles that need to be solved. After entering the answers to the puzzles on the website (now closed), serial codes for in-game items in all 3 games were given as rewards. In CHUNITHM and ONGEKI, this event was not considered part of the regular April Fools events, and 怒槌～光吉猛修一部謎～ was not revived in subsequent years.
- 2020: Site changed to "maimai でらっくす TSUKEMEN"; 六厘歌 (6/19~) [8] [9] [10]
- 2021: Site changed to "maimai でらっくす The Piano"; タケモトピアノCMソング [11]
- 全世界共通リズム感テスト revived in Asia
CHUNITHM
All April Fool WE charts were revived in subsequent years.
- 2016: Help me, あーりん！ (4/1~4/6) [12]
- Playable as イロドリミドリ Crazy Set Track 3 outside of April Fools
- 2017: あねぺったん (3/31~4/5) [13]
- 2018: イロドリミドリ杯花映塚全一決定戦公式テーマソング『ウソテイ』 (4/1~4/4) [14]
- 2019: なるがちゃんなぎにいよいよえれー目にあわされる話 (4/1~4/10) [15]
- 2020: 【3Dサウンド】小野ちゃんが真夏のビーチでスイカを叩き割る話【イヤホン推奨】, conflict(斉唱) (6月18日(木)～7月15日(水)) [16], [17]
- conflict(斉唱) was added in the announcement on June 17th
- 2021: 恋はりんりん☆あーりんベル [18]