Klax Redux: Wave 50 is tricky! Here's the solution.

If you liked Klax for older arcade and gaming consoles like NES or MAME, you'll love Klax Redux.
Play single player or multiplayer adventure and battle modes at GameSlush.com.
To help grow the Klax gamer community, if you've completed Wave 20 of the adventure mode, post your GameSlush username to the comments for a free 30-day membership and gain access to all 100 Waves. Available for a limited time.