Leap Day's was first announced to be in production under the name "Project Jump". Three mockup images of the game were shared.
Project Jump in action!, a video previewing Leap Day's gameplay, was released. Nitrome announces that the concept of Leap Day, then dubbed as the "jumping game", is to have a new level every day.
Via Nitrome's Twitter, it was announced that "Project Jump" would be most likely renamed to "Leap Day", accompanied by a screenshot of the game.
Leap Day is submitted to the Google Play and Apple App Store. Nitrome also posts a preview of the game's startup with the king-like creature pulling his lever via Twitter.
Leap Day's official release date is announced to be May 11. A preview trailer is launched alongside the notice.
Nitrome opens the availability of pre-release download codes for popular YouTubers, Twitch users and certain indie game developers. Those interested can obtain codes by emailing Mat Annal.
Leap Day is officially released and announced on the blog, Twitter and Facebook.
Leap Day is featured on Google Play and on the front page in the section "New Games We Love" of the Apple App Store.
Unlockable characters are announced to be arriving in a future update.
Nitrome announces an update that allows players with the premium upgrade to access the checkpoint sideroom rather than automatically activating checkpoints. They post a screenshot previewing the room with a "free unlock" chest.
Leap Day is featured in the "May's Best Games" section of the Apple App Store. Nitrome also shares a preview of the image sharing feature available in the upcoming "adjustments" update.
Update 1 is in the testing process. Nitrome shares a screenshot of Yolk in a selfie pose among some bombs.
A preview screenshot showing Lick on the character selection screen, along with a screenshot of Lick in a Desert themed level, is posted to Nitrome's Twitter. Update 1 is announced to be launched on the coming Monday (June 13).
Update 1 is officially released, with significant features including unlockable playable characters and selfie poses.
Nitrome officially announces Update 2 to be in the works, which will feature new backgrounds as well as new music.
Update 2's formal release date is announced to be on the following Monday (July 4).
Update 2 is launched and features two new backgrounds (City and Totem), each with their own unique music tracks.
Nitrome announces via Twitter that End Zones will be an added challenge to Update 3.
Leap Day Version 3.0's release date is announced to be for the following day. Nitrome posts a clip of the July 14 End Zone to Twitter.
Update 3 is launched and features the Beach theme and End Zones that replace the normal Checkpoint 1 in levels.
Nitrome tweets that they are working on additional hazards to be implemented in a future update.
Nitrome announces via Twitter that update 4's release is to be tomorrow (September 1) and uploads a video trailer showing off the new traps briefly.
Update 4 is released. It features ten new hazards or interactive objects (referred to as "traps"), along with new content and unlockable characters.
Nitrome is made aware of glitches pertaining to the Cactus Monsters, barrels and issues with lag. They also announce that they are looking into finishing the cloud saving update for Android.
Nitrome releases an update that fixes bugs with the Cactus Monsters and springs. The Android version of the update adds cloud saving.
Update 6 is released to Google Play. Nitrome announces that the Apple App Store version should be arriving either the following day or following Monday.
Update 6 is made available on both the Apple App Store and Google Play. The update introduces eight new unlockable characters.
A bug update is released that fixes the bubble traps, allowing players to reset their jump count after hitting a bubble.
Nitrome announces a Halloween update (Update 7) to be in the works and tweets a promotional picture previewing some of the update's content.
Update 7 is released. The update features a new science lab background, along with the new fish ghost enemies. A future update with a bunch of new enemies is announced to be in the works.
Nitrome fixes a bug that causes the playable character to become a white blob on iOS devices.
Nitrome announces a winter update and tweets a promotional picture to go along with it.
Leap Day gets featured on Apple's "10 Best Games of the Year" section of their App Store.
The Winter Update's release is set to be for December 22. It is announced that the update will contain new winter themed traps and enemies, unlockable characters and new backgrounds. A teaser of one of the winter levels is posted.
Nitrome officially releases their Winter Update and includes a release trailer, uploaded to YouTube.