Rust Digger
Recover three rust caches and return to the surface hatch at column 3. Tap an orthogonally adjacent square in Dig/Walk mode to excavate soil or move through a tunnel. Every move or brace uses one of 24 air units. Heavy boulders fall vertically whenever the ground beneath is removed; standing under an unbraced boulder is fatal. You have two steel braces. Select Brace, then tap an adjacent boulder to anchor it permanently before mining below it. Caches support rock just like soil until collected. Read the vertical load above each cache, make a side tunnel, and leave enough air for the return trip.
About this experiment
Recover three rust caches and return to the surface hatch at column 3. Tap an orthogonally adjacent square in Dig/Walk mode to excavate soil or move through a tunnel. Every move or brace uses one of 24 air units. Heavy boulders fall vertically whenever the ground beneath is removed; standing under an unbraced boulder is fatal. You have two steel braces. Select Brace, then tap an adjacent boulder to anchor it permanently before mining below it. Caches support rock just like soil until collected. Read the vertical load above each cache, make a side tunnel, and leave enough air for the return trip. Keyboard: Tab and Enter/Space operate buttons; R restarts.