["Developmental Science, Volume 29, Issue 3, May 2026. ", "\nABSTRACT\n\nThe capacity to deceive is a hallmark of cognitive sophistication. Researchers often use games requiring deception to study the development of this capacity, assuming such games effectively isolate the cognitive aspects from sociomoral considerations. In three studies we challenge this assumption by explicitly giving 36‐ to 83‐month‐old Singaporean children (N = 279) permission to deceive in such a game. We initially hypothesized that granting such permission would increase deception by reducing sociomoral concerns associated with deception. Instead, we found the opposite effect: children were less likely to deceive. This paradoxical effect was replicated, suggesting that moral considerations persist even in contexts where ethical guidelines are presumed to be suspended and that the cognitive and moral aspects of deception are deeply intertwined during early development.\n\n\nSummary\n\nChildren were less likely to deceive in a strategic game when they are explicitly given permission to deceive.\nYoung children still view deception games through a moral lens, even though such games provide a context where deception is normative.\nCognitive and moral aspects of deception are deeply intertwined starting early in life.\n\n\n"]