Retro Games Tournament

About
The Retro Games tournament is a tournament on Angry Birds Friends!. It happened in:
 * Tournament 2015: (March 2nd  to March 8th, 2015)
 * Octournament 2019: (June 17th to June 19th, 2019)
 * Tournament 2 2019 (June 20th to June 21st, 2019)
 * Tournament 3 2019 (June 22nd to June 23rd, 2019)
 * Octournament 2020 (February 17 to February 19th 2020)
 * Tournament 2 2020 (February 20th to February 21st 2020)
 * Tournament 3 2020 (February 22nd to February 23rd 2020)
 * Tournament 1 2021 (May 24th to May 26th 2021)
 * Tournament 2 2021 (May 27th to May 28th 2021)
 * Tournament 3 2021 (May 29th to May 30th 2021)

It's a Retro-styled tournament, containing various things from old games such as Pacman, Megaman, etc. There is also a special Mario Pig based off of Super Mario. The 2019 tournament replaced the main theme with a song from RETRY, one of Rovio's other games.

2015 Tournament
The whole background is 16-Bit styled. There are a bunch of snowy mountains and the Crown Mountains in the background. There are also bushes in both the background and foreground.

2019 Tournament
It's an electronic background which is a net with a bunch of connections with glowing spots that are blue. In the foreground, there are 16-bit bricks.

New features
It featured several things such as:

New Pigs: Miscellaneous:
 * Super Mario Pig: A strong 16-Bit pig, which drops coins and makes a pipe warp  sound when defeated. He is based on Mario but lacks the M on the hat.
 * Pixels: Comes in various colors. They are easy to destroy.
 * Coins: Easy to destroy objects which make a sound that is similar to the one from Mario.
 * Hearts: Easy to destroy objects which give 5000 points when destroyed.
 * Orange Rupee: Easy to destroy objects which give 5000 points when destroyed. They are based on the ones from The Legend Of Zelda.
 * Atari Breakout Ball: They are 16-Bit easy to destroy objects and give 5000 points when destroyed, they can bounce.
 * Coin Block: They are 16-Bit easy to destroy objects and are from Super Mario Bros .  They were Exclamation Blocks in the 2015 tournament but are Interrogation Blocks in the 2019 one.
 * Cherry: They are 16-Bit easy to destroy objects and are based on the ones from Pacman.
 * Megaman Hat: A pig's wear.
 * Band: A pig's wear. They are based on the one that Spirits Bill wears in the game Contra.
 * Link Hat:  A pig's wear. They are based on the one that Link wears in the game The Legend Of Zelda.
 * Sonic Quills Hat: Another pig's wear. It's from Sonic The Hedgehog.
 * Super Sonic Quills Another pig's wear. It's from Sonic The Hedgehog.
 * Dr. Eggman Pig: An angry pig with orange moustache and goggles. Also from Sonic The Hedgehog.
 * Master Sword: Another easy to destroy object. It's based on the one from The Legend Of Zelda.
 * Jumpman Hammer: Another easy to destroy object. It's based on the one from Donkey Kong.
 * Red Potion: Another easy to destroy object.