There is a pterodactyl cheat in Joust 2 that's very similar to the
one in the original Joust. Start on wave 11 (just to make it easier
to get started). Work your way up to level 13. There is an object
towards the top right of the screen that you can stand next to.
Kill everything except a few greys - leave them flying around. Now
position yourself just to the right of the object on the top and
point your lance toward the right. The pterodactyls will fly right
into your lance, just like in the original Joust. The greys will
just fly around confused, unable to find you. They will come close,
but will turn away. Don't flap, or they will be able to find you!
The only way you can get killed this way is if a grey is bumped
into you somehow, and this is quite rare. The wave will end only
if the remaining greys are sucked underwater by the lava troll.