These are typically released by developers to celebrate milestones or events. Using these codes can provide players with bonus in-game currency, allowing for higher-stakes play, or unlock cosmetic items like new table skins or card designs.

Time estimate: 4-6 hours of play to unlock all base characters.

The "HD" designation in these games introduces a more technical side to "codes": asset modification. Unlike standard definition games of the past, HD games utilize high-resolution texture files. Advanced users often look for file modification codes (or mods) rather than simple gameplay cheats.