I found an "easy" way to unlock the final battery by mining for 2:10.
once you have reached the red planet, and have great technologies, just use the very basic engine, that way you'll be super slow and it will take about 2:30 to reach the lava level...
maybe once the player has finished all the actual episodes, no fuel appears in levels or from crates
this would prevent the game from lagging and would allow the player to see what's happening in later levels
 "Monster Clearer"){kind=icon}
 "Dozenbear"){kind=icon}
 "Reach the core"){kind=icon}
 "Bowmaster Winter Storm"){kind=icon}
 "Bubble Tanks Tower Defense"){kind=icon}
 "Cyber Chaser"){kind=icon}
 "Earn to Die 2: Exodus"){kind=icon}
 "10 is Again"){kind=icon}
 "Mamono Sweeper"){kind=icon}