Mega Bloks Nano-Smokin' Stunt City Have some major tire-squealing fun with this Mega Bloks Nano Smokinâ Stunt City play set. Set includes enough Nano bloks to build 4 different vehicles (2 at a time) plus accessory parts like 6 track pieces, 2 stunt jump ramps and cone and barrel obstacles. The smokin' t-bar launcher lets kids control the power and speed and race head-to-head. Other great features include an integrated Cold Flame smoker, T-bar gear stick/pumper, "nos"-style pressure tank and sound chip.