Crystal Defenders 100% Walkthrough: W2 Map Melby Point (adv)

Melby Point (adv) Wave 9 -- Upgrade lvl 2 thief to lvl 3 (11:54) Wave 24 -- Upgrade lvl 4 black mage to 5 (7:54) Wave 26 -- This wave I severely screwed up and as a result I had to summon ifrit to keep from losing to many crystals. (If you have a better strategy or tips, please comment below)