Out of all of them, the "Dig to the Core" game seems to have the most promise. You might consider incorporating some sort of "sand simulation" (cellular automata) to make it a bit more engaging so you could do things like simulating lava flows, cave-ins, etc.
Out of all of them, the "Dig to the Core" game seems to have the most promise. You might consider incorporating some sort of "sand simulation" (cellular automata) to make it a bit more engaging so you could do things like simulating lava flows, cave-ins, etc.
Good luck!