If the player activates TNT using flint and steel, they will still be blown up on peaceful difficulty. The death message will say "Player was blown up by Player", with the player's username.
Activating TNT through redstone or a dispenser containing flint and steel will have no effect on a player while on peaceful.
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Comments 10
I can confirm it does damage even in peaceful difficulty (50 half hearts). NOTE : It only occur when you activate by flint and steel. If activated by another source (except flaming arrow) the TNT won't do damage
Confirmed in 13w11a.