Birthday

A Birthday is the anniversary of an individuals birth. In just about every reality the occasion is celebrated by the individual in question along with their loved ones. Common traditions associated with birthdays include holding a party or a gathering, the giving of presents to the one who's birthday it is, and the presentation and consumption of a birthday cake.

In the Prime Zone, Sonic the Hedgehog has celebrated his birthday on multiple occasions in both timelines. In the current timeline, a surprise birthday party held by his friends was interuppted when the Time Eater appeared and distorted time and space. After teaming up with his younger self from the past, he eventually defeated the monster and restored reality-and the party-to normal. This event was also believed to have occurred during the timeline briefly created by the second Genesis Wave. (VG: SG, StH: #259)

In the Pre-Super Genesis Wave Timeline, Sonic celebrated his 15th birthday in 3235 by waking in the early hours and stuffing himself with chili dogs as an early birthday gift to himself. A year later, Sonic returned with Tails from their hunt for Ixis Nagus just in time for the hero to celebrate his 16th birthday. The year after that, Sonic celebrated what was presumably his 17th birthday (his actual age up for debate due to his time in space), only for the party to be crashed by Bean and Bark and later Croctobot. A few days later, another party was organised to make up for the previous party being ruined, although it ended up being postponed several times due to Sonic himself constantly missing it. (StH: #11, #68, #160, #161, #167)