The Room 4: Old Sins (2018)

Twisting a dial or sliding a hidden panel is the point of these puzzles, so the touchscreen is an advantage rather than a substitute mouse. A strange dollhouse links a complete, atmospheric mystery with a definite ending. The iOS and Android editions are paid upfront; the iOS listing requires version 10 or later. Choose this for patient inspection and tactile mechanisms, with occasional hints when a small detail escapes you.