In Alive-4-Ever, how to unlock the gold weapons

The question about how to blow up the bridge: Mark the engineer and point out the building neerest to the bridge as a target - that will blow up the bridge. Enjoy and sorry for my english

The key is that speed of zombie spawning is somewhat controlled by how fast you kill them, so try to make it as slow as possible. Potato mines are great early on. Snow peas are also good at doing slow damage. And of course you can just throw up walls for them to slowly eat through. Buy yourself enough time and you should have no problem getting enough sunflowers going.