R=red square
G=green triangle
B=blue set
.=empty field
Level 2:
RR.G
G.R.
B...
.RRG

Level 3:
GR.R
..BR
....
B.RG

Level 4:
RG..
..RR
B.G.
GR.G

Level 5:
.RR.
..BG
GRGR
RRRG

Level 6:
.BR.
.BBG
GRGR
GRB.