Easter egg

Easter eggs are usually hidden surprises or tricks. They are small surprises programmers add to their media for players to uncover, much like chocolate eggs in a real-life Easter egg hunt. Many Easter eggs are purely for entertainment. Some examples include hidden names or faces of programmers, references to other games, or messages for the player.

Easter eggs should not be confused with glitches, cheats, or techniques. Many do not alter gameplay at all, and are added on purpose.

Characters

 * The text "SMAAAASH!!" will appear when Ness swings his fully charged bat or in a 1/19 chance of the same move, but uncharged; this is a reference to the same effect in Earthbound.

Stages

 * Frank, a Mr. Saturn with a camera found on Saturn Valley, was based off the Photo Guy and Frank West from Earthbound.
 * In 0.9a, Qui's name was signed on Dracula's Castle. This was removed in 0.9b.
 * Since v0.8a, on the Sky Sanctuary Zone stage, if the player look closely at the background, sometimes they can watch Eggrobo fliying trough the stage. Despite the stage was redesigned in v0.9a, this easter egg is still present. On the same stage, Mecha Sonic is visible in the background, albeit Knuckles ruined it in their battle on Sonic & Knuckles, however, the Mecha Sonic easter egg is not present in the preview of SSF2 Beta and Eggrobo appears more frequently.

Items

 * There are food referencing other games. Like: the Rare Candy and Cheri Berry from Pokémon, the Energy Capsule from Mega Man, the Invincible Candy from Kirby (although it doesn't grant invincibility to the player), the Lon Lon Milk from The Legend of Zelda, the Sea-Salt Ice Cream from Kingdom Hearts, the Pork Chop from the Minecraft franchise and the Ramen from Naruto. And even the iconic meat from One Piece.

Website

 * On the Smash Flash DOJO!!!, a message saying "You are a nasty code-snooper!" can be read by viewing the page source.
 * At the bottom of the Smash Flash DOJO!!!, a message saying "Want to see something cool?" will appear. If the reader highlight it, the page will rotate in a full circle and redirect you to the "How to play" section.