Radar — free browser game

The sweep line at the center of the green radar screen rotates continuously clockwise. Three invisible targets move slowly across the screen; the moment the sweep line passes over a target, it lights up as a bright dot and fades out within a few seconds — this short window is your only clue. To hit a target, predict the direction it moves after it fades and click a point near its current position. The hit tolerance is small: you score a hit if there is a target within 22 pixels of where you clicked, and because the target is in motion it will be in a completely different position a second or two later. Each hit earns one point, and a new target spawns after a delay with a more random trajectory. False signals (red interference) also appear under the sweep from time to time; if you click them you take a two-point penalty, so ignore them. The time limit is 60 seconds; when it ends, your total number of hits is your score, and the best score is saved. Strategy: don't wait for the same sector — keep extrapolating the target's direction of motion in your head in the region the sweep just passed, and click without waiting for the next sweep — if you wait, the target leaves the sector.