Move. Tap the map in the direction you want to go, or use the arrow keys, or W A S D with Q E Z C for the diagonals. East and west wrap right the way round. The top and bottom edges are the poles, so you cannot step past them. You have a boat, so open water costs a move like anything else.
Climb. That is the game. Your score is the highest ground you stand on, as a percentage of the planet’s true summit, which is not shown until the end.
Landmark challenges are the bonus. Two are on offer at a time. Most require you to find several distinct places, and each completed challenge is worth more than the last.
Scoring. S is 140 or higher, A is 120–139, B is 90–119, C is 60–89, and D is below 60.
The world is (somewhat) predictable. Height is generated first, then sea level, then ocean currents, then the winds that carry rain inland, then the biomes based off all this information.
How the world is made ↗