By defeating the final boss of the game and speaking to cuttlefish you obtain a stone found in the Octovalley that allows you to view the credits and play the extra paint mini game.
For placing your inkling boy Amiibo during the game you are given 20 challenges, in sets of 3 and a Boss. When completing each set you are awarded extra in game items.Once unlocked Squid Racer will be available during all load screens pre battle.
Following the Version 2.0.0 Update, players can now receive new gear from Judd after reaching certain levels past Level 20.
Squid Beatz is both a rhythm game and soundtrack selection menu found at the arcade in Inkopolis after completing the fourth tier of Green Squid Amiibo Challenges and beating the Fourth Boss within the time limit. To reach the fourth tier, you must have also completed the corresponding levels in Octo Valley.
During the countdown before the level starts press accelerate right before the 2 clicks to 1. If performed correctly you will notice a significant starting boost.
Beat the Final Boss in the Single Player Campaign in order to unlock the following 2 sets for use in multiplayer(Each consists of a hat, shirt, and shoes)
Upon killing the boss in each set of stages you are awarded a scroll. Take that scroll to the weapon shop to unlock 7 additional weapons. You will also need the appropriate multiplayer level.