Reading this maze
The double doorway starts at row 4, column 5. Of the 42 grid positions, 31 are paintable and 11 are walls. The start is already painted; the other 30 tiles remain to be reached.
Diamonds A at row 3, column 6 and row 4, column 4 toggle both barred cells marked A. Start up and stop at row 1, column 5. Both A gates share one state; either A diamond flips both together. The first slide covers 4 of 31 target tiles.
The verified opening crosses 3 tiles before stopping. A breadth-first search proves a 29-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.