This game is mean to be like a Tower Defense sort of game for the DS, and I hear it is really good. If you use the voucher above and Quidco then you should get it for just £9.39 from PowerPlay Direct.
Otherwise, if you prefer you can get it for £9.99 from Play (or £9.59 with Quidco): http://www.play.com/Games/DS/4-/6080089/-/Product.html?P36=DHEK73
Build and Battle for the Ultimate Construction Combat ever! From the creators of Drawn to Life, is the next new hit game Lock's Quest!
A diabolical mechanical army devastates a kingdom as village after village fell under their wrath. Only a young, brave hero, Lock, is the kingdom's last hope to survive the oncoming invasion. As a newly trained Archineer, Lock must utilise his skills to build customised towers, traps, walls, weapons, and other defenses in order preserve the precious source artifacts.
Two modes of play:-
In Building Mode: Utilize strategy to build structures, walls, weapons, and traps in order to protect the source artifacts
In Battle Mode: Use the stylus to battle robotic invaders; Launch special attacks moves to quickly eliminate enemies; Collect scrap metal after each defeat to build additional structures and weaponry
Build and battle in 100 different areas with varying terrains on the map
Multiplayer: Play with friends and battle against other kingdoms via Wi-Fi
Flag-Creator: Create and design a unique flag to represent your kingdom.