another case i actually want to take a type of game in chinese chess (XiangQi) call 江湖残局. the rule is simple, the chess game run as normal but the chess placement is designed to be almost end-game. you just need to finish the game normally. But heres the clever part, the placement will looks like it has an extreme advantage on you (not kidding and no exaggerated), but in fact it is hard af, 1 step wrong then you'll lose, and even if you can regret the move, it also hard to win.
by designing it to let people think it is easy, it trap many people to waste time on it. if the placement design looks like the player didnt have high advantage, it is hard to raise the play rate (edited)