The Baby in Yellow

The Baby in Yellow disguises itself as a babysitting simulator at first, ordinary tasks like feeding and putting the baby to bed play out normally, right up until the baby's behavior stops being ordinary and the house starts reacting to it in ways a real infant never could.

Because the horror escalates gradually rather than all at once, completing the early caretaking tasks calmly rather than rushing tends to let the game's slow tonal shift actually land, several unsettling details are easy to miss if you're moving too fast through what still looks like a normal routine. Later tasks demand reacting to genuinely strange requests rather than instinct alone, so paying attention to what the baby specifically asks for matters more than assuming the same caretaking logic still applies. Fears to Fathom builds a similarly slow-burn horror pace out of an otherwise mundane setting.