Hello !
Today I will show you a cool 1.9 command to blow up all your worlds ! =D

Drop a dropper on the top of a crafting table to craft your mines. All the crafts are in the video

The LandMines:
Normal LandMine: explodes when detects an entity (player, horse, arrow...)
Powerful LandMine: explodes like the normal landmine but with more power
Incendiary LandMine: explodes like a normal landmine but burns all around
Proximity LandMine: invisible, detects the entities with a 3x3 range, do some little sound when a player is very close
Hidden LandMine: explodes like a normal landmine but looks like dirt, stone, grass or sand
Special LandMine: explodes only if it detects an specific entity (it exists for players, horses and hostile mobs)

The command and the Map:
http://gabgaming.wix.com/gabgaming#!mines-v2/udq0u
If your a redstonner and you want to understand the system, you can download the map that I used for the video