Syncline is a grid-based puzzle game in which the player rolls a straight line of cubes across a board and lines it up with goal blocks. The line tumbles as a rigid body: it can lie flat or stand on end, climb terrain, and split apart when driven into obstacles — cubes that cannot pass break off and remain on the grid, where a later move can reconnect them. Rotating the camera in 90-degree steps changes the movement directions and decides which cubes are kept when the line splits. Hazard blocks destroy or transform cubes that land on them; nothing is randomized, and every level is verified solvable by the game's own solver and stamped with a par move count. The game features a campaign of themed level packs, a built-in level editor backed by the same solver, and community level sharing through mod.io. Inspired by Bloxorz and Cuboid.