The ninja tanks are NOT hard. You notice when yu are hit, and you can use the 4x shot upgrade, swipe the area, and find them, also you can see the bullets. Tip: use EMP noobs!
Oh God, I'm tired of this game. The impossible badge isn't impossible, just really, really time-consuming. Must have played it for hours, considering that I played through a whole regular campaign first xD
To learn to fly you have to sit on the small stone pedestal in the temple where "Solomon unlocked the mystery of flight", and you will "learn it" after a little while. To fly you must jump up and hold the 'UP' button.
Remember that 'space' don't activate the shield if your playing on mouse-mode.
I don't think it was very hard, just play till you can fully upgrade everything, and it should be easy ;)
Loves that a game finally has the ability to sell all upgrades, witout losing any money/points or whatever.
5/5
Buy all upgrades.
1) Run
2) Jump in
3) Lean left
4) Aim upwards while using ('Up' 'Up' 'Down' trick)
5) When losing hight, do a backflip
I got 1803 points :D