When can you kill enemies in the border? Sometimes I kill them, sometimes they kill me.
Killing enemies that have made it to the rim (border) it mostly done by "timed firing". As the enemy reaches the rim of the tube(s) on either side of you - just a quick firing burst should kill any close by flippers and pulsars. It is also possible to move (avoid) underneath enemies too, though it is very difficult to do this consistently at the higher waves. Note: fuseballs that remain at rim can only be killed by super zapper charge – though I have moved under a fuseball on more than one occasion.
What should be the order to shoot down enemies? I’ve tried lots of strategies, but they doesn’t seem to work.
I just aim for clusters of enemies and try to pick off what I can as the come down the tube. I try to be aware of how enemies are moving so I a prepare my next attacks. When pulsars come into play at wave 16 you have to listen (audio que) for look (tube break) before you can attack as you will die if you’re on a tube that breaks during their pulse. I also use the spikes quite a bit to increase my firing rate - though be careful when a pulsar is on the spike too. And by all means kill fuseball as quickly as you can.
How can I select levels after 9 one? I can’t. Yesterday I died at the 11th, and I couldn’t start from there.
When you’re selecting a bonus start wave, there is a wave you can't select until you clear it i.e. to have the 74,000 wave 11 bonus available you must have cleared wave 11; to have the 94,000 available you must have cleared wave 13 and so on. If you don’t clear a bonus start wave you go back to one bonus wave.
Is it better to play from the beginning or from the last level? There is a huge point difference, but it seems the game get harder too.
Always select your highest available bonus wave for maximum points - of course the game get harder; wait till you see the Invisible waves, if they actually put them in that is.
How in the name of *** can I erase all spikes in Level 5? I´ve tried anything, but it seems impossible.
Still working on this one too.
Is there someone who can actually PLAY at throttle monkey? It´s just horrible.
There is a trick to it - i.e., use spikes and try not to move widely.
Why can´t I get the 9th level achievement when I have finished it? Have I to start from level 1?
Yes, you must start at level 1. There are a couple of APs that have this requirement.