score 50 points in endless mode
unlock 5 heroes
complete 10 missions
score 100 points in endless mode
unlock 10 heroes
complete 20 missions
score 200 points in endless mode
unlock 20 heroes
complete 30 missions
score 250 points in endless mode
unlock 30 heroes
complete 40 missions
score 300 points in endless mode
unlock 60 heroes
complete 50 missions
score 400 points in endless mode
unlock 80 heroes
complete 60 missions
score 500 points in endless mode
unlock 90 heroes