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Stack the aliens on each other correctly and prevent them from falling.
Arcade
Santa
Elisa
Cat W
Diamo
Minec
Super
Royal
My Li
Clock
Carto
Jumpi
Austr
Nadia
Army
Spin
Jump
Hallo
Smash
Rolly
Three
Socce
Black
Color
Pop P
Ghost
Monst
Winx
Wild
Zoo M
Princ
Pounc
Count
The C