Masonry Ledger

Build a connected five-block walkway across the marked row, with a strength-4 keystone in its center. Place strength-1 bricks next to existing masonry or the two stone abutments. In Fuse mode, select neighboring equal bricks to combine them at the second square. Every remaining brick must stay connected to an abutment through side-touching masonry; a fusion that would strand a section is rejected. You have ten bricks and twenty construction actions. Reclaim can remove a strength-1 brick and return it to stock, but only twice and only if the rest stays connected. Build support around a fusion before removing its old anchor. Wait spends an action. Keyboard: Tab and Enter/Space operate buttons; R restarts.