Type the codes (without the quotes) at the 'Main' menu to activate the corresponding effect. Click Lex when you are playing in Adventure or Arena mode and the enemies in the Tome of Knowledge to fill up the 'Secrets' section.
Lex wears a Party Hat and Fireworks Explode: Type 'CELEBRATE'
Lex wears a Turkey Tail and Leaves fall: Type 'GOBBLE'.
Lex gains a Coffee Mug and is Rained on: Type 'SEATTLE'
Lex gains a Scarf, Cocoa, and is Snowed on: Type 'WINTER'
Lex is surrounded by Hearts: Type 'LOVELY'
Lex wears a Moustache: Type 'MOUSTACHE'
Lex wears a Road Cone: Type 'CONE'
Lex wears Pancakes: Type 'PANCAKES'
Lex wears Pirate Costume and Giggles: Type 'PIRATE'
Lex will Hiccup: Click Lex while in-game
Lex will Giggle: Click Lex while in-game 4 times
Lex will Sneeze: Click Lex while in-game 8 times
Show Enemy's 'Hit' Animation: Click an enemy in the Tome.
Show Enemy's 'Death' Animation: Click an enemy in the Tome 6 times
Show the Attack's Animation Click an enemy's attack in the Tome.
The Tile Grid changes to L33T Letters. Type 'ELITE' at the 'Main' menu or in-game.