No Clue Crossword

Getting used to common crossword puzzles? Try to solve the more challenging Clueless Crossword! 
When the game opens, the vowels of the hidden words will be filled into the corresponding blocks of the puzzle, while a list of the 26 letters will be presented at the bottom of the screen. Hover your mouse over an empty blank, and all the blocks which contain the same letter will also be highlighted. Click a block and select a letter on the list to fill in the blanks. Note that only letters highlighted in blue on the list can be selected. If you would like to remove a letter in a block, you can click the corresponding block, then click the cross button on the right of the alphabet list to delete the letter. The time you have spent is recorded at the top right corner of the screen. If you are not able to make a move, you may click the Hint button on the right of the puzzle to reveal an answer, but each time you do so 20 seconds will be added to the time you have spent. Solve the riddle timely and you will be rewarded handsomely