Red Star

Added in B3313 v0.9, the Red Stars are a newly introduced mechanic to the ROM hack and serve as a loose sense of progression the player can achieve through exploring the castle.

Red Star Locations
Note that these locations will like be changed up in the final release. Also, due to v0.9's unfinished nature, some Red Stars are actually just retextured Yellow Stars and will count as such. Therefore, the star door in Haunted Castle Grounds leading to the ending route, which requires 13 Red Stars to enter, can not be unlocked via normal means.

Real Red Stars
These Red Stars, when collected, will let Mario and Luigi regain their abilities, and also influence Hard Mode:
 * Bowser in the Dark World: Defeat Bowser and collect the Red Star he drops. This is usually the first Red Star that the player is guaranteed to come across.
 * Bowser in the Bully Battlefield: Defeat Bowser.
 * Bowser's Checkered Madness: Defeat Bowser.
 * Bowser in the Dark World (beta): Defeat Bowser.
 * Bowser in the Sub: Defeat Bowser (appears as a Yellow Star, but counts as a Red one).
 * Captain Fly Guy's Tower: Defeat Captain Fly Guy and collect the Red Star he drops.
 * Floor 2B: There's a Red Star inside a cork box, hidden well within the floor's giant maze.
 * Goomboss' Lair: Defeat Goomboss.
 * Mario's Maze: Once activating the instant warp, you will find a Red Star at the end of the pitch black hallway. You need to evade several deadly faceless Mario clones to get it.
 * Stellar Tower: Collect 8 red coins in the air with the Wing Cap (appears as a Yellow Star, but counts as a Red one).
 * Toad Catacombs: Collect the 5 secrets by desecrating the dead Toads.

Fake Red Stars
These Red Stars count as Yellow Power Stars, and add to the star counter. They do NOT grant the benefits a real Red Star would give.
 * Basement Maze: There's a Red Star hidden inside a "?" Box inside the room full of fake "!" boxes.
 * Bowser's Castle: Talk to the Toad in one of the hallways at night.
 * Bowser's Checkered Madness: Break open the cork box for a Red Star.
 * Bowser in the Airship Cabin: Defeat Bowser.
 * Floor 2B (beta): Talk to the Toad in the room with the fake "!" boxes. You can get another red Star here by breaking one of the real "?" boxes in the room.
 * Ice-Cold Warzone: Collect the Red Star at the top of the mountain.
 * The Star: Collect the 5 Silver Stars on the edges of the big Star.
 * Wf.z64 (beta): Reach the Star at the top of the tower within 40 seconds to obtain the Red Star.
 * King Whomp's Battle Arena: Defeat King Whomp.

Red Star Effects
As the player collects Red Stars, they will slowly unlock more facets of their moveset.

First Red Star
Before the first Red Star is collected, most extra areas are blocked off and inaccessible:


 * Any doors in the Castle Grounds aside from the ones leading to Beta Lobby A/Beta Lobby E (such as the entrances to Crescent Castle and Toad's Lobby) will not open. The tunnel leading to Dark Hallway also doesn't function.
 * The fountain in Uncanny Courtyard will not warp the player to its windy state, and the entrance to Battle Fort is blocked off.
 * Warping back to the lobby via the pause menu will only send the player to Beta Lobby A.

After the Red Star is collected, the "personalization" is enabled, and the game will open up to the player properly. Additionally, Mario/Luigi will gain the ability to Long Jump as well as Kick Flip (a move which replaces the vanilla game's Slide Kick maneuver). Additionally, Mario's/Luigi's Side Flip will be restored to its original height.

Second Red Star
Upon collecting the second Red Star, more doors within the castle will open up and allow the player entry. Mario/Luigi will also regain the ability to Backflip, Sweep Kick/Breakdance, and crawl.

Third Red Star and Beyond
From this point, the player does not gain any unique abilities or advantages from collecting any more "Real" Red Stars. However, continuing to collect them will influence many of the Hard Mode changes the player might experience.

Trivia

 * While not particularly relevant to the player unless they happen to sequence break, collecting the first star also enables many of the game's jumpscares and spooky events (as an example, the pipe teleport in Plexal Basement that sends you to the flooded state of the level does not function unless 1 real Red Star has been collected).