TNT is WAY too powerful. detonating one pixel of it will clear out all of that destroyable City 5. I liked maksprog's pressure explosive, but your TNT is a one-pixel-nuke. Please reduce its power.
Please also make H2 so if 2 of them are in contact, and the H2 has enough enough temperature and pressure it will fuse (fusion) into NBLE (helium to be specific, in real life), and also will release an electron (which if it contacts a NBLE will turn it into PLSM) and a photon. It should release a good ammount of pressure and the individual particles leaving the reaction should be the maximum possible temperature. Also for a single instance of 2 H2s fusing, the pressure at the place where the reaction took place for a radius of a few pixels should be raised by 10 to 25 pressure units (should be controlled by random). A decent sized container of H2 should therefore make a tremendous explosion (easily outdoing MaksProgs pressure explosive, and theoretically if the amount of H2 used was enough, could result in an effect like your TNT). The minimum requirement for 2 H2 to fuse is they are in direct contact with each other, both have a temperature of at least 4000 (or their average temperature is at least 4000, so if one was 3000 and the other 6000 fusion would still take place), and the pressure in the region must be at least 50.