Frontline Tactics is a F2P turn-based tactical game on Steam and iPad. The best way to describe the game would be to imagine X-COM (or rather the new XCOM), but distil the experience to the absolute basics. You lead a team, initially of only 2 people, against small groups of insurgents in a near-future desert backwater. Every mission earns you in-game cash, which is the only currency in the game and is used to unlock new guns, body armour, skills, proficiencies, member slots. Real cash can buy you in-game one, but it is neither required nor encouraged.
The fights take place on
very small maps, which are constantly recycled; new ones become available as you win more battles. The skirmishes themselves are also short but surprisingly satisfying. Flanking and sneaking up are possible, and the difficulty ramps up steadily, so that no map has a "solution". The game also offers robust multiplayer (vs and coop; haven't tried it personally).
All in all, the game is surprisingly satisfying. Old-school JA and X-COM vets may find it lacking in features and difficulty, and the graphics run smoothly on older-gen on-board chipsets. But the bite-sized engagements can serve as a quick diversion, while still having that
je ne sais quoi that can eat into your sleep. iPad may be the better choice here ;)
http://store.steampowered.com/app/218310/ [url=http://steam://install/218310]steam://install/218310[/url] - I don't even know if that kind of linking works