Is it possible to detonate the TNT in the free version of Minecraft? It would seriously help if I could simply blow up the hill in front of my castle instead of removing it block by block.
I don't believe so. The free version (Creative Mode) doesn't have any "gameplay" to it. You can just place and remove blocks and that's it.
Shit, the game doesn't cost that much, just buy it! If you enjoy it you will get tons of hours of gameplay at 1/3 the cost of a typical game.