Seven of the things you find in the picnic baskets of Kettlecrest are tools: a Tow Line, a Splash Pump, a Picnic Blanket, a Flat Iron, a Ripple Rattle, a Beaver Plank and a Siphon Straw. This Wednesday’s dev diary is about how we built them, and about the one rule every tool had to pass.
The picture at the top is Fennel in Pinewood Rapids with a Siphon Straw. It’s very long and striped red and white, and it runs from his mouth over the side of his pumpkin into the river.
The rule: nothing hunts the leader
Nothing flies ahead, nothing seeks out whoever is in first place, and nothing is dropped behind you as a trap. And every tool has an answer: something the boat on the other end can do about it, if it’s quick.
So the Tow Line hooks onto a wave, not a boat. The Splash Pump hits the nearest boat beside you, within 8 meters, whether it’s ahead, behind or level. The Blanket and the Plank are laid ahead of you and open to everybody. There’s no speed boost in the baskets at all.
Tow Line
A surge that rolled past you isn’t lost. Cast the Tow Line at a crest 6 to 25 meters ahead, and the reel pulls you up the back of the wave and onto its sweet spot, where your ride begins. The answer: a boat reeling in is on a leash, and one bump snaps the line. A jet from a Splash Pump snaps it, too.

Splash Pump and Flat Iron
The Splash Pump shoves the boat next to you sideways with a jet. The target gets a warning first: a red line on the water and a note that says “Pump aimed: steer into the jet.” Steer into it, and the push is cut in half. Ignore it, and the jet costs you a knitted heart.
The Flat Iron is the other answer. For six seconds a big iron sits on your bow, so heavy that the boat dips its nose. The boat becomes two and a half times harder to shove, so a jet barely moves it and nobody can push it off a crest. It steers a little slower, though, and it’s no help against rocks or banks.

Ripple Rattle
The Rattle is a wooden ratchet that the hero whirls over their head. Shake it just before a surge arrives, and for twelve seconds the sweet spot on the wave is 40 percent wider, so it’s much harder to slip off. Shake it during a ride, and it adds two seconds to the ride instead.
The first Rattle made the sweet spot 60 percent wider and added four seconds. In testing, a boat with nothing but Rattles in its baskets beat the usual mix of tools by up to 22 points of wins on Flood, the highest river level. So we cut it back.

Picnic Blanket and Beaver Plank
Some shortcuts stay shut until somebody opens them. A mud bar slows every boat, and a Picnic Blanket spread over it makes it ordinary water for six seconds. A rock garden is shut on all sides by low boulders, with two beaver-gnawed stumps at its upstream corners. Lay a Beaver Plank, and a deck of boards unrolls over the stones for six seconds. Whoever gets on rides it to the end.
The Plank adds no speed, only a shorter line, and it gives that line to the boats behind you too. That’s why good racers lay it at the last moment. Burl, the beaver, always does.

Siphon Straw
The Long River has a smooth, glossy band of fast water running down it. The Siphon Straw bends it. For four seconds, the fast water curves over to your line, from 15 meters behind you to 25 meters ahead, easing back at both ends. The answer: if someone bends it out from under you, get on its new line.
Drawing it took two tries. A wide bent band looked like a stripe of paint across the river, so now it’s a narrow, light ridge with little streaks running toward the straw.
How we test a tool
To check the rule in numbers, we wrote a small test. It runs the same race 120 times with the computer at every paddle, ours included, fills all our baskets with one tool and compares the results with the usual mix. A tool fails if it beats the mix by more than half a place on average, or by more than 20 points of wins.
The Rattle failed, and we fixed it. The Flat Iron looked like a fail on Flood after 60 races, at nearly 22 points, but after 120 it came out at 14. Sixty races were simply too few to tell, so every test now runs 120.
Glacier Gate and Pinewood Rapids, all seven tools included, are free to play in your browser at kettlecrest.com. The full game, all six reaches to the sea, is $4.99, paid once. More about the game is on its Kettlecrest page.



