Short answer: Yes, with help at the start.
What works at this age: Sort, Story and Detective all land at six, and the Poster Studio becomes their own thing rather than a joint project. The early Typing rows are within reach.
What’s harder: FontRun at speed, and the longer story chapters read solo. Expect requests for help with the designer facts in the Fontdex.
What they’ll get out of it: Real early-reading practice, first typing habits on a physical keyboard, and the start of the collector loop — six-year-olds tend to be the most Fontdex-obsessed age.
What to expect in the first week: A few assisted sessions, then they take over. Expect the Fontdex count to become a dinner-table topic.
Font Quest is a Mac & Windows desktop game — $14.99 once, no subscription, no account, no ads, and it works offline. If it isn’t a fit, there’s a 30-day refund, no questions asked.