scoreboard objectives add tntexplode dummy tntexplode
scoreboard players add @s tntexplode 1
execute @s[scores={tntexplode=79}] ~ ~ ~ summon zombie
execute @s[scores={tntexplode=79}] ~ ~ ~ summon spider
execute @s[scores={tntexplode=79}] ~ ~ ~ summon skeleton
execute @s[scores={tntexplode=79}] ~ ~ ~ summon skeleton
execute @s[scores={tntexplode=79}] ~ ~ ~ summon creeper
execute @s[scores={tntexplode=79}] ~ ~ ~ summon enderman
execute @s[scores={tntexplode=79}] ~ ~ ~ summon zombie
execute @s[scores={tntexplode=79}] ~ ~ ~ summon zombie