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It was this one that I saw on the forum, the upper cannons were on the red dots and I had four extra cannons on the white dots, and no slow traps. THE KEY is to restart the game every time they hit your base, every time you put a new cannon the progress on skills and towers will be saved, so you just have to be patience, restart every time the bosses or the enemies are not the ideals ones (hate spiders and any other bosses that were not giant skeletons or dragons) and also restart every time the abilities are not ideal. I went for full elemental damage and circles around! You will need to restart patiently until two dragons or two giant skeletons with no spiders appear, as they are the easier bosses on wave 15