Block the 3 single isleways with long range snipers so the enemy cant pass and set up a tower in the larger isleway center at the entry in the V formed by the wrecked red cars. This way, all of the ground forces have to pass it. Then raise it to BBQ as your snipers earn money. As you earn, add an aircraft gun in the middle-rear by the HEY bus even with the E. Raise it to the highest sniper level. With it and 3 ground snipers, the aircraft can't last. Add another tower 5 spaces forward of the first BBQ and raise it up to BBQ too. At some point in there, add a launcher in the rear near the H in the HEY bus because a couple enemies can get to it. Now upgrade Matryoshka. Then, add a megaphone in the middle of them and increase it to highest radar level. You now have the level in your grasp. Burn it up!

Madagascar is the correct answer, however it's EAST of Africa

Desert Freighter is completable by building just one BBQ electric tower near the start (there is a Secret Spice achievement for this too!). To star a sudden death level, you need to run all waves early.

It means which enemy will tower shoot first, Fastest, Slowest, Weakest.

Build some level 3 Tesla Coils where the creeps come, and it will defend you for a few early air waves too. That will help save money. Then build the air towers, and build some fart and goo towers to defend the ground waves, and if you have enough money building nukes will help too. I did it with these conditions: massive builder 10 frequent upgrader 10 damage 10

It is not when you complete all the single player. You get it just before the Italy level, I forgot which one exactly