Elf Overtime

A Christmas toy-building game for kids and grown-ups. Read the kids' crayon letters, grab toys and parts off Santa's conveyor belt, snap them together, and drag each finished toy onto its letter before the sleigh leaves.

Next morning the sleigh visits every house. The right toy, built well, gets cheers. The wrong toy gets thrown in the snow, and sometimes the dog runs off with it.

Ways to play

• Little Elf: a slow belt and forgiving snaps, for ages 5 and up.
• Big Elf: the real job. New toys, gold rush letters, belt jams and power cuts as the nights go on.
• Christmas Eve: one night that never ends and keeps getting faster. Three lumps of coal and you're out.

With Fidget, Clove, Old Nutmeg, Doug the sleepy elf, and Santa. Free, plays in your browser, works offline on iPad and iPhone once loaded.