"Sodium can best be described as a Facebook game. No, seriously – any of you who've played Mafia Wars or any of the "freemium" games where microtransactions drive gameplay will know exactly what they're getting into when they discover that only the first five out of 50 levels of Sodium are free. Sodium features a futuristic sci-fi setting where players pilot tanks to shoot up other tanks in an arena setting. There are other quests, too, such as stomping neon colored scorpions or a drinking game called Desert Quench – you'll have to check with the cyborg non-playable character Vicky to get them. Some quests are isolated experiences where you blow up NPC tanks; others are social games where you work cooperatively with other players to, say, squash a certain number of scorpions. Also, the developer said there were tower defense missions and proper boss fights at the end of each level." - Annie Ok from Bookmarklet