Match the Hatch

1. Turn two cards. Click or tap a card, or move to it with Tab or the arrow keys and press Enter or Space.
2. Look for a natural and its imitation. Cards marked with a green corner are insects; cards marked in terracotta are flies. A pair is always one of each.
3. Remember what you saw. Cards that do not match turn back over. Fewer moves earn more stars; the clock is only for your own curiosity and does not start until you turn the first card.
4. Read the recap. When the last pair is found, the game explains why each fly resembles its insect.

• Mayfly dun ↔ is imitated by Adams

  The dun rides the surface with wings held upright like a sail. The Adams copies that outline with upright hackle-tip wings and a stiff collar that keeps it standing on the film.

• Mayfly spinner ↔ is imitated by Rusty Spinner

  After laying eggs the spinner dies with its wings flat on the water. The Rusty Spinner lies flush in the film, wings outspread, for trout sipping at dusk.

• Caddis adult ↔ is imitated by Elk Hair Caddis

  An adult caddis folds its wings like a tent over its back. Swept-back elk hair gives the same roof shape and floats well enough to be twitched.

• Caddis larva ↔ is imitated by Green Rock Worm

  Free-living caddis larvae are bright green grubs with a dark head. A curved hook, green dubbing and a dark head are all the Green Rock Worm needs.

• Stonefly nymph ↔ is imitated by Rubber-Leg Stone

  Stonefly nymphs are flat, with two tails and sprawling legs, and crawl rather than swim. Rubber legs wave in the current the same way when the fly bumps along the stones.

• Midge pupa ↔ is imitated by Zebra Midge

  A midge pupa is a tiny segmented comma hanging under the surface. Wire ribbing over thread copies the segments, and the bead stands in for the swollen thorax.

• Mayfly nymph ↔ is imitated by Pheasant Tail Nymph

  Swimming mayfly nymphs are slim and tapered with three tails. Pheasant fibres give the taper, the tails and a mottled brown that passes for many species.

• Grasshopper ↔ is imitated by Dave’s Hopper

  A grasshopper on the water is a big meal kicking with long hind legs. Dave’s Hopper has knotted legs and a chunky head that lands with the right plop.

• Ant ↔ is imitated by Foam Ant

  From below, an ant is two dark lumps joined by a thin waist. Two blobs of foam with a turn of hackle between them make that silhouette exactly.

• Freshwater shrimp ↔ is imitated by Sawyer’s Killer Bug

  Shrimps tumble along the gravel all year and are a grayling’s staple. The Killer Bug is only wool over wire, but when wet it turns the same translucent pinkish grey.

• Crane fly ↔ is imitated by Daddy Long Legs

  A crane fly on the water is all trailing legs and feeble wings. The Daddy Long Legs copies it with knotted fibres splayed behind a thin body, and is taken with a slow, deliberate rise.

• Caddis pupa ↔ is imitated by Deep Sparkle Pupa

  A caddis pupa swims up to hatch inside a loose skin that holds bright bubbles of gas. The Sparkle Pupa wraps its body in a veil of shiny yarn to carry the same glitter of trapped air.

Recipes for these patterns in the fly box