Hottaaman no Chisoko Tanken

Players get to dig up dirt beneath the surface, find keys behind four doors, and then find the door to the next level. The most obvious game to compare it to is Dig Dug, but without the boulders and with various devices like teleporting doors, speed, dynamite, and a wet suit. There are 15 levels in the entire game; which repeat themselves after the 15th level is finished. Lava can spew out at a vertical direction towards the player and kill him; it does not reset itself even after the players l...