There are four unused cheat codes in Plok! that were disabled, each of which spells a word with the inputs of the SNES controller, and displays a message on screen. These were disabled, and therefore cannot be used under normal means:

• Right - Up - B - B - A - Down - Up - X (Rubber Ducks) - Displays "NINTENDO POWER" and warps the player to the Test Level
• Y - A - B - A - Down - A - B - A (Yaba Daba) - Displays "JOHN'S CHEAT" and gives the player 16 Buddy Hornets
• B - Right - Up - X - Y - A - Left - Left (Brux Y'all) - Displays "LYNDON'S CHEAT" and gives the player 160 shells
• Up - Right - B - A - Down - Left - A - Down (You're Bad, Lad) - Displays "BAD INFLUENCE!" and makes the player invincible for 13 seconds

Nintendo Power and Bad Influence are both the names of 90s-era gaming publications, meaning that there may have been an intent to share the codes through those platforms.

"John" is likely referring to Plok! co-creator John Pickford, while "Lyndon" and his code "Brux Y'all" refers to game designer and sprite artist Lyndon Brooke.

Plok! did not feature any rubber ducks, however, a later Pickford Bros. game, Wetrix, would, and the eventual Plok! the Exploding Man comic would feature the rubber duck from Wetrix as a main protagonist.