There are 30 levels. I found 16,17 the hardest.

Level 16, place red to complete + sign at bottom...this pushes the green up, completes silvers and top blues. Complete the set of reds to push the green left. Complete the set of reds to push the green down. Place green two right of the current green. Last green in the middle pushes both blues together.

Score on Challenge mode only submitted when you reach level 5 and 10.

Very good word game...need to plan ahead and use strategy. Small words can open up the board for bigger words later.

Have to be quick. Similar to other pipe-connect games - but time is a huge challenge with this one.

Clever concept, would like to see more levels with even more enemies. Very nicely done.

Unlike other pipe games,you can only rotate powered pieces. Takes a lot of forethought to complete. Tough game...very good.