To celebrate selling 10m copies of its computer game Mine-craft, Swedish start-up Mojang decided to treat all its workers to a surprise trip last year.

After breakfast at its Stockholm headquarters, employees were whisk-ed off in limousines, private jets and a fleet of Ferrari and Lamborghini super cars to Monte Carlo. Two days of partying ensued involving casinos, helicopter trips to restaurants and dancing on a yacht with Norwegian group R?yskopp as a DJ set.

This year, it plumped for just a boozy ferry trip across the Baltic. Not that Mojang has had a bad year: Minecraft, a sort of digital version of Lego in which players use blocks to build a virtual world, helped bring in SKr2.1bn in revenues (up 38 per cent on the previous year) and SKr816m of profit in 2013.