Landscape Mode:

Arrow Keys: Move (Up/Down/Left/Right)

Click on a cell to enter it

Or zoom in to enter overview mode

Walkthrough Mode:

Arrow Keys / WASD: Walk through cell

Q / Space: Move up

Z / Shift: Move down

Mouse: Look around (click to enable)

Mouse Wheel / Pinch: Zoom out to Overview

Overview Mode:

Mouse Drag: Rotate around cell

Right-Click Drag: Pan

Mouse Wheel / Pinch: Zoom in/out

Zoom in → Walkthrough Mode

Zoom out → Landscape Mode