"Etherium [official site] is unlikely to work its way into anyone’s list of strategy favourites but if you’re a fan of traditional RTS games, its short bursts of action might be as welcome as a cool pint of H20 during a drought," said our Adam in His Wot I think. Now, I'm not too good on logic, but I believe that means that this game is just the ticket on a hot muggy summer's day. Perhaps pour a splash of Robinsons orange squash over your computer too - this is Wimbledon time, after all.
You can test that logic for yourself, as the full game is free to try on Steam all week, and half-price if you want to keep it.
It's a base-building RTS with a strong focus on territory, where you only have a limited number of production slots in each bit you capture and therefore need to make decisions wisely. It's got problems (don't we all!), but seems worth a punt for free a least.
Until next Monday, July 20th, you can play Etherium for free through Steam. It's the full game, so you can get stuck right in. If you dig it, it's half-price until Monday too, down to £7.49.