step 1 - enter elimination game and you must get 100 silver coins
step 2 - buy all the accecories from the reward section in elimination game
step 3 - now go to deathrun get 300 silver coins and buy all the accecories
step 4 - get 100 friends and play whit them minimum 15-20 minutes
step 5 - make a match online
step 6 - win the match
step 7 - exit the game
step 8 - open the game
and you should have unlocked luigi!