We got the latest Lego Batman 3: Beyond Gotham cheats for the PC and consoles and what we have here would allow you to unlock all the playable characters in the game as well as the super secret Batman level!
To get things started, you need to pause the game, select the "Extras" option, and choose the "Enter Code" selection. Then, enter one of the following codes to activate the corresponding cheat function as verified by Cheat Code Central:
Characters
Aquaman V3GTHB
Atrocitus ZGCEAJ
Bane XZKLKQ
Batgirl 4LS32K
Batman (Planet X, Zur-En-Arrh) ZWQPJD
Beast Boy YC3KZZ
Blue Beetle APEKBV
Deathstroke 5SW59X
Doctor Fate 4HRERD
Frankenstein FQ4ESE
Giganta 95U7BM
Kevin Smith J6ANCT
Lobo B5ABPQ
Music Meister S7GSDE
Nightwing N9CZ7S
Plastic Man H2VB8Z
Red Hood TRQTPS
Superboy QDQ3YL
The Fierce Flame NQ46RC
The Joker 9WYGLP
Unlock Storyline characters
Alfred: Get the "Activate The Elevator" objective at the start of Hub Visit 1.
Batman (The Joker disguise): Start Level 12.
Brainiac: Successfully complete Story mode.
Cheetah: Start Level 8.
Cyborg: Start Level 3, and get the rocket ready.
Green Lantern: Get the "Restore The Com Link" objective in Hub Visit 2.
Indigo-1: Progress through the storyline.
Killer Croc: Progress through the storyline.
Lex Luthor: Defeat Mr. Freeze at the start of Hub Visit 5.
Martian Manhunter: Get the "Restore The Com Link" objective in Hub Visit 2.
Plastic Man: Defeat Mr. Freeze at the start of Hub Visit 5.
Robin (Lex Luthor disguise): Start Level 12.
Saint Walker: Progress through the storyline.
Solomon Grundy: Defeat Mr. Freeze at the start of Hub Visit 5.
Star Sapphire: Progress through the storyline.
Superman: Start Level 7.
The Flash: Start Level 3, and get the rocket ready.
The Joker: Progress through the storyline.
Wonder Woman: Start Level 6.
Wonder Woman (Cheetah disguise): Start Level 12.
Secret 1966 Batman TV Show level
Successfully complete the game to unlock the "Same Bat-Time! Same Bat-Channel!" bonus level. Go to the Batcave's main room, and fly up to the elevator with the Bat-logo to the left of the Batcomputer. When in the trophy room, fly to the far right to reach the studio set, which looks similar to the Wayne Manor study in the 1966 Batman TV show. Switch to Batman or any character with a grapple gun. Pull the grapple point to the left of the bookcase to reveal a secret passage. Slide down the pole to start the bonus level.
