1st Infinity Gem
The 1st infinity gem is at Pvp Zone, Wait for white portal to appear, go in, complete the parkour, win a 1vs1, And collect the stone!
2nd Infinity Gem
2nd infinity gem is at Mental Dimension, Find the maze,Solve it, Kill Doctor Xtrange(750M HP), and collect the stone!
3rd Infinity Gem
3rd infinity gem is again in Mental Dimension, Unlock dwarfs zone, Kill 100 Dwarfs(each of them has 50M HP) and collect the stone!
4th Infinity Gem
4th infinity gem is in Mental Dimension too, Unlock Titan,Kill 100 Super Krills(each of them has 175M HP) and collect the stone!
5th Infinity Gem
5th infinity gem is located in Quantum Realm, Find 100 Stone fragments and collect the stone!
6th Infinity Gem
6th infinity gem is the hardest one to get, its located in Destroyed Revengers HQ, Unlock it by getting Revengers HQ for 15 Rebirths, then find a platform with a Order Orbital Attack text, then go in, Kill all Revengers in that zone, and collect the last stone!
You dont have to do it in order, i just showed how you can do it in easier way :)
Revengers HP(for last stone)
Location of Every Revenger For Last GemStone: Destroyed Revengers HQ
Newbula: 950M HP
Irony Man: 900M HP
More info how to get to Irony Man is at Irony Man Page
Captain Marvellous: 3B HP
Buffed Shrek: 3B HP
Warning!: His cars are op, but easy to dodge
Thor and Rocket: 1,5B HP
Dark Panther: 600M HP
Black Widow: 900M HP
Audition: 900M HP
Captain Democracy: 900M HP
Warning!: When he is at half HP(or less) He summons all Revengers Alive to him!