The R2DA 100th Version Celebration is self-explanatory; it celebrates R2DA's 100th version. Something hardly achievable for the previous games of the line-up. Although not being an event, it did introduce special permanent features that otherwise wouldn't be around for another part of the year.
|Chronos XI||Stone Golumn||Golumn||Wraith|
|Party Whistle||Firebox||Clockbomb||Chronos Chest||Flame|
|Chronos Quest||Chronos Dimension|
|Defeated Chronos XI|
- This is the second celebration of something in the R2D series that introduced permanent features, the first one being R2D's 8 Million Visits Mini-Event that introduced King Cake and the ability to spawn Cake on top of your head once a round, at will.
- Informally known as the "Chronos Series".
- This version contains the most amount of weapons released in a single update, those being the M249, Famas, RPG and Karambit.
- The Chronos skin was added several updates later after the release of the event, as was the Chronos Chest and Chronos XI badge.