Ringfall TD

Eight lanes ring a castle, and the swarm is coming down every one of them.

Ringfall TD is a maze tower defense for up to eight players, co-op or PvP. In co-op, each player holds one side of the ring: wall off your lane, set turrets into the walls, and stretch the creeps' path as long as it will go before they reach the far end.

What gets through doesn't just vanish. It runs on into the next player's lane, and whatever makes it all the way round attacks the castle in the middle. Catch your teammates' leaks, and count on them to catch yours.

Co-op or PvP

Two teams, a square of lanes each. Hold your own lanes, hire miners to dig ore, and spend it on mercenaries that go with the next wave into the other team's lanes. Save up and send them all at once: every lane they get out of pays you. Play friends or AI players in a game of your own, or queue for ranked 1v1 to 4v4 and climb a ladder by rating.

Three factions

• Humans: rapid-fire guns, rockets and shells that wear the swarm down.
  
• Organics: poison clouds, acid sprays and spines that eat through whole packs.
  
• Aliens: lasers, photon blasts and plasma lances, slow to charge and devastating when they land.

Twelve buildings each, towers that keep on upgrading, and six ways to choose what they shoot.

Know your enemy

Six damage types against four kinds of defence. Bullets tear through flesh but glance off carapace, poison seeps through psionic shields, and blasts swat flyers out of the sky. Read the next wave, then build for it. Crawlers, Rippers, Juggernauts, Serpents, Wyverns and more, with a boss every tenth wave.

No last wave

The waves never end: see how far your team can hold. Long waves speed up, so nobody sits waiting.

Rare finds

Now and then a creep drops something: gems that turn a tower's damage into another type, Overcharge Cells, Stasis Mines, Life Shards and Bounty Charms. Bosses always leave a trophy.

Play together

• Up to 8 players: fill the ring with AI teammates, or take on the swarm with an all-AI team
  
• PvP from 1v1 to 4v4, with AI players for any empty seats in your own games
  
• Friends list, invites, open games and chat with your team
  
• Signs in with your Steam account, and plays with everyone on Steam, Android and the web
  
• Dropped out? Start the game again and you're straight back in your lane

Leaderboards

Score for kills, catching leaks, saving up interest, readying up early and clearing waves quickly. Rank by your best game and by your average, and climb a ranked ladder for each PvP format.

Online only: needs an internet connection.