Would you like to unveil a medieval mystery which includes unusual mechanisms and some sort of sorcery? Codex is a fun online slot game made by Leander Games. It comes with quite sophisticated visual elements including many animations and special effects and a view of the mechanism in the background. There are 5 reels and 20 paylines in this game where the wild symbol replaces all missing basic symbols. Get three invention symbols to get multipliers. Landing at least three Free Spins symbols will activate up to 12 free spins. All in all, this is an exciting online slot game with decent bonuses.