https://mojang.com/2015/04/minecraft-snapshot-15w14a-the-love-and-hugs-update/
Changelog
Gameplay
We have removed the ability to directly harm other creatures. You should be
rewarded for helping, not hurting.
Removed Health and Hunger. We feel that these are not appropriate gameplay
mechanics for a game about love, sharing and peacefulness.
Added a new “Love” meter. This fills up the more you help others, and
others help you.
“Survival” mode has been renamed to “Existence”.
Animals
Bats are now 20% cuter. Squeek.
Chickens can now be ridden by any player less than two blocks tall.
Cows will now alert you to important events that you may have missed by means
of an audible notification.
Pigs can no longer fly, but can now climb on walls.
Rabbits are fluffy.
Sheep will, if asked nicely, share their wool to keep you warm.
Squid changed, but we’re still trying to figure out how or why.
Monsters Inhabitants
“Monsters” are no longer named as such. The preferred term is “Inhabitants
”, as they live in this world just like you or me.
Steve and Alex have realized that the inhabitants are not evil, and just want
to hug and get along.
Creepers no longer explode. They have gotten over their nervous disposition
and are much more friendly once you get to know them.
Skeletons have revealed themselves to be very efficient farmers, having a
permanent source of bone meal on them at all times.
Blazes are actually pretty cool guys and will defend you from harm.
Guardians have put aside the initial misunderstanding, and now welcome you
into their home with arms… erm… eyes… wide open.
Ghasts are no longer frightened so easily, and will offer you rides
throughout the nether.
Slimes are now pretty fun to hang around with, sharing their secret jumping
abilities to those that will listen.
Witches are super friendly and surprisingly knowledgable. They will help you
by sharing their potions.
Zombies are extremely cuddly and love to hug.
The Wither has been replaced with his lovable pink counterpart, promoting
vitality and nourishment to the environment around him.
Weather & Environment
Removed rain as it upset a lot of players.
Falling snow has a chance to make exposed chests mysteriously full of goodies
at midnight.
Villagers & Villages
Trading has been rebalanced. We felt that the previous incarnation wasn’t
very fair, and believe the new system is a step towards helping fix this.
Villagers will offer you help in picking up items or blocks, in exchange for
a small fee for their services.
Iron Golems can appear as a manifestation of the village’s love for you.
Blocks
Lava has been replaced with liquid cheese. It’s delicious and much safer!
TNT has been replaced with a much friendlier block: A love bomb.
Items
As we no longer have a hunger system, food items now give Happiness instead
of Saturation.
Carrot on a Stick has been removed. It was just cruel to pigs and we are very
sorry for this.
Combat
Bows no longer require arrows.
Shooting things makes them fall in love with the first thing they see.
Removed combat.
World generation & terrain
Dungeons have been replaced with homes, offering a much more inviting and
comfortable experience for everybody.
All caves have been checked by the Minecraft Safety Committee to ensure a
safer experience for players.
Desert temples no longer contain TNT traps, and come with a nice, safe way to
access the bottom floor.
Some cliff edges may be lined with fences to avoid accidents by the unwary
traveller.
Jungle temples are no longer trapped, containing instead a new rare Golden
Creeper to reward exploration.
Potions
Some potions such as Strength or Harming have been removed, as we no longer
have a place for them in the game.
Added four (4) new potions:
Love Potion
Happiness Potion
Potion of Sharing
Potion of Caring
Fun Potion
Transportation
Horses can no longer be ridden as this was deemed unfair to the horses.
In compensation to the horses, they can now ride on your shoulders.
Minecarts now have a fluffy pink interior.
Added obsidian boats which are impossible to break.
Improved regular wooden boats.
Added dirt bikes.
Ender pearls no longer transport you to the target, but instead the target to
you.
Weather & Environment
Added rain back as it soothed a lot of players.
Falling snow has a chance to make exposed chests mysteriously full of goodies
at midnight.
Game Settings
Not everybody had the same experience playing Minecraft under different
configurations, so we decided to remove all the graphical settings.
You may now only have one world, in order to reduce fragmentation and to
treat all worlds as equals.
Some resource packs were prettier than others, giving some players an unfair
advantage in the amount of fun they were having. This has been fixed.