Let me first say that
Swords and Soldiers HD is chock full of gaming goodness. There's a ton of gameplay here and you won't get bored anytime soon. Initially, you'll have the option to play the Campaign on Single Player with the Viking Campaign, being open to you. There is also the Aztec Campaign and the Chinese Campaign, which you can play if you want to, but in order to benefit from the storyline and learning how the various weapons work, it is best to play them through in order of appearance.
Each campaign has its own ridiculous and twisted storyline. The Vikings are trying to host the biggest and baddest BBQ ever. In order to do that, they really want the giant spicy red pepper that the Aztecs hold and they will stop at nothing to obtain it. In the Aztecs' campaign, they are trying to protect their pepper from the Vikings, but there are also warring factions of the Aztecs who want it, and rival leaders Lovsbatl and Fullthrotl fight it out, aided by the potion-crafting guy, Poisonbotl. Lastly, the young and bratty Chinese Emperor seeks the most toys of everyone and of course, he wants the pepper too.
Each race has their own types of fighters, from the lowly foot soldier on up to the powerful warriors. In order to "make" a warrior, you must first mine gold and the gold pays for the warriors. In most levels, the first order of business is to make enough gold so that you can buy more gold miners, of which you can have 10 at one time. Once you have enough money, you can go into the options menu and select warrior types from a tree, starting with the lowliest and moving on up to purchasing the most powerful ones like the Sun Giant. There are also power-ups like a dose of health or Thor's Hammer for the Vikings, the ability to use Pooh Ki as a flame-tongued dragon to decimate enemies of the Chinese, or even a giant rolling boulder of death to smush the Aztec's enemies. There are also spells that can be purchased like a snow storm, a volley of flaming arrows or even the ability to use mind control!
Once you complete the initial campaign, you'll unlock Challenges like Survival, Berserker Run and Boulder. Survival is exactly what it sounds like, you pick a race and then try and survive for as many minutes as you can. Berserker Run has you as Arnie the Viking Berserker, blasting through enemies and surviving for as many yards as he possibly can. He'll be able to pick one spell to assist him in his run and that's it! Lastly is Boulder where you control the boulder and you must tap the screen to bounce it in order to avoid smashing your troops, but yet crush everything and everyone else.
Multiplayer options include a skirmish where two people share one iPad and each selects a race to play as, and a color, if they both choose the same race. Then you choose between three different maps of varying difficulties and sizes, then battle it out, plain and simple.