Dig Dug - Wikipedia

Dig Dug (series) - The Big Cartoon Wiki

Tank Force - Wikiwand

Dig Dug Island - Wikipedia

Oil's Well, a fine cocktail of Dig-Dug, Snake, and Pac-Man – Retro365

Dig Dug II: Trouble in Paradise (1985) - MobyGames

Dig Dug - C64-Wiki

Dig Dug (series) - The Big Cartoon Wiki

Sharp X1 Games: Tetris, Gradius, Pac-Man, Mario Bros., Lode Runner

Some Reverse Engineering for Dig Dug Game, by Cfir Aguston

Dig Dug by Jesse Russell

Some Reverse Engineering for Dig Dug Game, by Cfir Aguston