Reading this maze
Open gallery starts at row 3, column 4. Of the 42 grid positions, 33 are paintable and 9 are walls. The start is already painted; the other 32 tiles remain to be reached.
Diamonds A at row 6, column 1 and row 5, column 3 toggle both barred cells marked A. Start down and stop at row 5, column 4. Both A gates share one state; either A diamond flips both together. The first slide covers 3 of 33 target tiles.
The verified opening crosses 2 tiles before stopping. A breadth-first search proves a 24-slide finish from this exact starting board; that is a reference target, not a move limit. You may revisit any painted tile.
Switch A is a diamond; gate A has bars when closed and a dashed outline when open. Entering the switch toggles it immediately, including during a slide. If you get trapped, undo or restart; Hint checks the current gate and painted-floor state.