Blitzed (Mind Loft)

Blitzed takes Mind Loft's Blitz ladder and adds a third number to every line. Problems such as 5 + 10 x 2 mean you have to apply the order of operations and keep an intermediate result in mind. The twenty lines climb through five rounds, from small chains and the times tables up to brackets, percentages of a number with something added, two-digit products and cubes.

You choose from four answers by tap or with keys 1 to 4, and each problem has a twenty-second clock. The decoys are real mistakes: the most common is doing the first operation and stopping, so that answer is often among the options, along with a dropped carry, an ignored bracket, a left-to-right reading or the neighbouring cube.

A wrong answer or an empty clock ends the run, and your score is how far you climbed. Everyone plays the same twenty problems in the same order, the furthest run tops the leaderboard and ties break on time. A new set arrives every day at midnight Eastern.