Is Sandbox a real game mode?
Sandbox is a board-editing tool mode, not a scored competitive game mode.
Tool mode
Sandbox is the mode for people who look at a chess position and think, "what if the board obeyed me for once?" You can place pieces, move them, erase them, and build demonstrations without asking legality for permission.
Sandbox is for experimenting, teaching, showing ideas, and making positions that would make a tournament director quietly leave the room.
Sandbox lets you edit a 5x6 Pocket Shuffle Chess board by placing, moving, and removing pieces freely.
The point is demonstration, not competition. Legal restrictions are relaxed so you can create examples, tactic diagrams, and weird test positions quickly.
Sandbox positions can be used for visual explanations, setup experiments, and teaching moments when a normal game flow is too restrictive.
Use Sandbox when you want to explain a pattern, test a position, or create a board state faster than a legal game would allow.
Sandbox is a board-editing tool mode, not a scored competitive game mode.
Yes. Sandbox is designed for free placement, erasing, and movement on the compact board.
No. Sandbox is for experiments and demonstrations, not leaderboard scores.