The Bowser Challenge is a challenge in Super Smash Bros. Melee issued mostly to advanced players in certain tournaments, to beat a team of three Bowsers on Fountain of Dreams. The challenge was originally developed by the Superfriends crew of Southern California, and posted by HugS in February 2005.
There is no well-known equivalent to the Bowser Challenge for other games in the series, though the concept would be simple to carry across: a fight against a team of the heaviest character on one of the smallest legal stages.
Sometimes humorous rules are included for the Bowser team, such as "taunting at the same time (or doing something else of hilarity) after KOing the challenger", or "pressing X, Y, X respectively on the winning screen".
While the match can seem in favor of the challenger due to Bowser's mobility and attack speed weaknesses (especially against faster characters such as Sheik and Fox), the three Bowsers can easily cover most of the stage in hitboxes, giving the challenger very little opportunity to attack safely. Combined with Bowser's weight requiring lots of damage to be delivered before landing a KO, the match itself is considered extremely difficult to win, provided that the Bowser players are semi-competent. Another disadvantage is that friendly fire is not on, allowing the Bowsers to take a considerably more aggressive fighting style against the opponent than in actual matches.
The level of difficulty can be seen even among the highest-level players. In one tournament, famed Melee player Ken Hoang was unable to get a single KO in the match; at this same tournament, Captain Jack, who was notable for successfully defeating Ken's Marth in friendlies, only got 4 KOs, as Ganondorf.
There is no official evidence that proves that a professional has won a Bowser Challenge. In the present, the current record is 5 KOs out of 12, which is held by multiple players.