GemCraft Labyrinth

This game is all about strategy. Luckily, it comes with an extensive strategy guide that you can refer to until you get the hang of the amazing gameplay. You’ll have to use magic and wizardry to complete this game. It’s much more interesting than most mario brothers online games you’ll be able to find on the web today. The story is really good, and the music is excellent. If you want to play on the go, there’s an iPhone version of the game too.

Click on spell buttons, click to place buildings, drag gems to where you need them.
Everything can be done with mouse, but there are also some shortcut keys:

T – Build tower
R – Build trap
A – Build amplifier
L – Build lightning shrine
C – Build charged bolts shrine
W – Build wall

G – Combine gems
B – Throw gem bomb
M – Extend mana pool
Q – 1x/3x game speed
Space – Freeze/unfreeze time
N – Send next wave instantly
X – Refund mana from gem
D – Duplicate gem
U – Upgrade gem (duplicate & combine)
I – Enable/disable info panels
1,2,3,4,6,7,8,9 – Create gem
P or Esc – Go to the Options screen
Shift-click on gem to change target priority
Ctrl-click on a wave store to send all waves