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The previous way to explode TNT was by punching it. However, you can also make the TNT explode by placing it near lava (a timely manner to explode it), clicking on it with flint and steel, or any contact with fire. If you were not in classic, it could also be ignited by Redstone or fire charge or even a fire arrow (assuming you have the latest version of minecraft).
In the related links below, I have listed the wiki article for TNT.
What else can I help you with?
How do you make TNT explode on the free version of Minecraft?
If you mean classic (Which I think you do) It wasn't made to explode (as is: It can't)
How do you make TNT explode on minecraft?
I assume you mean TNT. All you have to do is hit it.
How do you make TNT work in Minecraft classic?
you need to be in multi-player or a server to make the TNT work.
How can you explode Minecraft tnt?
you can with different of stuff eg: lava, fire charge like those thing. You can redstone power to set off a TNT
How do you explode TNT in Minecraft?
TNT can be ignited by using a Flint and Steel on it, or providing charge via a switch (lever, pressure plate, etc) or by an active redstone current.
