Lockstep

Two hikers, one altitude. Get them to meet.

Ana starts on the left and Bo on the right, roped at exactly the same height. They climb and descend together, so getting past a peak can mean the other one walking backwards.

Based on the Mountain Puzzle. Your progress stays on this device.

The lockstep map

Each point is one place for Ana (across) and one for Bo (down) at equal height. Start at the corner. The diagonal means they’ve met.

Keys: ↑ climb, ↓ descend, a turn Ana, b turn Bo, u undo, r restart.

Mountain Workshop

The hikers can always meet, whatever you build. Build the mountain that makes them work hardest: the score is the fewest steps it can possibly take.