Hello! Today, I've made Halloween Mode, a mode that is much more difficult than any other gamemode you've ever seen! I hope you enjoy this year's halloween, and lets get into this!

Click here for the command!

Recommended:
This gamemode is recommended to be used with a resource pack, which can be found here! The resource pack changes textures and adds a lot more feel to the gameplay.

Tutorial:
Things that have changed:
All mobs will have pumpkins on their heads (if they are able to equip them)
All mobs have a 20% health boost
Zombies will give any players within five blocks of them slowness two and weakness two
Spiders and cave spider will trap you in webs when you get close
Spiders will inflict poison when damaging a player
Players and mobs will bleed if damaged
Enderman will teleport you to them and attack you, no matter whether you look at them or not
Days and nights last about two minutes
During daytime, magma cubes, blazes, zombie pigman and silver fish will spawn
During night time, zombies, skeletons, spiders and creepers will spawn (the usual)
Pigs, cows, chickens and sheep will no longer spawn
All mobs have a 20% strength boost

Credits:
By Code202

Notes:
For 1.10
I'll say it once more, command block tutorials are coming soon!