The Highgrounds weekly tournament resets every Wednesday at 5pm PST. Don't freak out when your tournament rank drops to zero -- everybody's does at that time. It's actually a good thing; gives you another chance every week to earn free gems and free units (the first 20 ranks or so are the easiest ones to climb!)
Hey everyone, just wanted to say that we're aware of the strange bugs with poison and bombs and we're trying to fix it. We have no idea why it suddenly started happening, but we'll let you know as soon as we've fixed it!
@coolpapa - "few enemies" means that you will be attacked by a small number of new enemies during each new wave. "many enemies" means that you will be attacked by a larger number of enemies. In other words, "many enemies" == more intense combat.