Word Ninja

You are the word ninja! So make meaningful words using the letters appearing on the tiles and don’t let the tiles get filled. If you are running out of empty tiles use your ninja stars to wipe them. The longer the words you make, the more you will score and will get closer to be the champion on the Leaderboard.

RULES:
•   The letters can be selected from any tiles and don’t need to be adjacent.
•   Proper nouns or abbreviations are not allowed.
•   The tiles of suggested word will be wiped after a true suggestion but will be replaced with new letters gradually.

SCORING SYSTEM:
2 letter words → 1 point
3 letter words → 3 point
4 letter words → 5 point
5 letter words → 10 point
6 letter words → 15 point
7 letter words → 25 point
8 letter words → 35 point
9 letter words → 50 point
•    8 and 9 letter words wipe the most bottom row letters.
Words longer than 9 letters have [LENGTH] × 11 points and wipe the most two bottom rows.
•   the maximum accepted length is 20 letters.