so i cleared lvl 15 in 4 steps but different colour options than expected and always get failed as result. changed approach and finished in 4 steps as well, to be called correct solution...
1st way: red , green , blue , yellow
2nd way: red , green , yellow , blue
 "Dangerous Adventure 2"){kind=icon}
 "Coloruid"){kind=icon}
 "Elephant Quest"){kind=icon}
 "Innkeeper"){kind=icon}