[Resolved] GC9G8YK Slightly Fizzy Challenge

Could you please write a checker that shows the user has filled 18 squares in the Difficulty/Terrain grid? Any 18 squares are acceptable and any type of cache is acceptable. Thank you.

Here is your checker, please test and reply

https://project-gc.com/Challenges/GC9G8YK/63169

Thank you. The checker is perfect.