Sequence Breaking

Sequence Breaking (also known as a 0 Red Stars run) is a mechanic in B3313 that lets player bypass collecting any red stars and visit most areas in the game before intended to.

Explanation
Normally, the player is meant to eventually grab the Red stars from either Bowser in the Dark World (Shoshinkai) or Bowser in the Sub via the levels in Beta Lobby A/Beta Lobby E, as they are subtly guided there by the fact that almost all entrances to other areas besides the Beta Lobby and its paintings are locked and inaccessible until the first Red Star is obtained. Despite this, there are actually a few ways the player can access the rest of the castle before they are intended to:

Methods

 * The first and the easiest way is to reach the hedge maze section of Uncanny Courtyard by parkouring up the back wall. From there, the player can either collect the Red Coin star to teleport to Sunny Courtyard, or simply head to the Funhouse in the back of the peaceful state.
 * The second way is to collect 10 Power Stars through the available levels, then look up in Beta Lobby A/E to be sent to The Star.
 * (v0.9) The third way is to die in the Castle Grounds, with the easiest method of doing so being to drown in the moat. Doing so will warp the player to the Plexal Lobby at the cost of an extra life. This method was remove in Unabandoned 1.0.
 * The fourth way is to die in the Bowser Boss-fight, sending you to Plexal Lobby, similar to the method used in The Star.

Note that some doors will still be inaccessible until player collect a second Red Star, and that going through any Two-Way warp that would otherwise send player through a door that cannot normally be opened without any Red Stars will prevent player from going back through it, making them one-way.

METHOD 1
Even though player already done a Sequence Break, here's an alternative method which requires 10 (normal) stars before player can do it.

Trivia

 * Curiously, a lot of the surprise warps/teleports and intentional crashes are completely disabled without any Red Stars. If the game would normally teleport player somewhere or otherwise jumpscare player with a crash, it will not occur at all. For a few examples:
 * Mutant Toad will not trigger its jumpscare.
 * Approaching Luigi in Fountain of Truth does not crash the game.
 * The pipe in Plexal Basement does not send the player to the flooded state (the pipe does not function) Some crashes however, will still happen, including the one in Randomized Realm and the Lethal Lava Land painting in Vanilla Basement.