It also introduces something that was sorely lacking in its predecessor: cooperative play. Two players can choose to play through the entire campaign together or take on the Endless Mode for bragging rights. Unfortunately, the campaign recycles the levels from the single-player campaign, so there aren't many surprises if you played through it alone. Also, there is no matchmaking service. Friends are a requirement, which means they must own the game as well. Luckily, you can buy a 2-pack with a $5 discount.
The level design is absolutely one of the highlights of the game. The levels get more difficult and complex as the game goes on, but never too much to cause frustration (although some do induce panic). The in-game economy requires you to make some interesting tactical choices too: if you want that perfect choke point to funnel every bad guy into, you will have to save up to build barricades to block off other routes. This effectively means you can afford to purchase less traps, and less help for you.
It was clear that some of the levels were designed with co-op in mind, making single-player more frantic but not impossible. If you own Orcs Must Die! you will also have access to Classic Mode, which unlocks 10 levels of the original game to be played in co-op; a nice perk for those early adopters of the game.
Technically the name of the game should be Tons of Different Monsters Must Die! but that doesn't roll off the tongue. Orcs Must Die! 2 introduces some new baddies, and they are tough. Different types of ogres, trolls, dragons, elementals and of course orcs have you constantly changing your play style to best deal with the variety of baddies.
While the character dialogue is quirky and oftentimes hilarious, it does tend to repeat itself. While I wouldn't go as far as to say it's annoying, I just wish there would have been a little more time in the sound studio, recording just a few...hundred more quips.
Overall, the gameplay and graphics are identical to the first game, and that is a good thing. If you never played the first one, I would suggest just diving into this sequel and skipping the original. Above all, let me make one thing clear: this game is fun. Using a spring trap to toss a group of orcs into a lava pit just never gets old.
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