Terms of Use for Sluiceway
Sluiceway: Water Puzzle Published by OFO Labs
Last Updated: September 2026
Please read these Terms of Use before using Sluiceway. By downloading or using the app, you agree to them.
Acceptance of Terms
By accessing or using Sluiceway, developed and published by OFO Labs, you agree to be bound by these Terms of Use. If you do not agree, do not use the app.
The App
Sluiceway is a puzzle game for iPhone. You cut channels into a hillside drawn in cross section and route a spring into a mill cistern. The water is simulated rather than animated: the app works out, sixty times a second, how much water each cell of the ground holds and where it moves next. Everything runs on your device and the app makes no network requests.
What we claim about the simulation, and what we do not
We think this belongs in the terms rather than only in the marketing.
The fluid in Sluiceway is a deterministic cellular model in integer arithmetic. Water falls into the cell below it at a rate the two materials allow, and equalises sideways with its neighbours as a fraction of what each of them can hold, which is why a channel next to dry sand loses water into the sand and then stops. Sand takes water slowly and holds it in its pores, clay takes none at all and sends what lands on it running sideways, gravel moves it many times faster than sand, and bedrock does neither.
That is a model of groundwater, and a model is not groundwater. It is built to make the four materials behave differently from each other in ways you can read on screen and plan around. It is not a hydrogeology tool, it does not solve Darcy's law, and nothing in it should be used to predict what water will do in real ground.
What "every level is proven" means
We say in the listing that every level in Sluiceway is proven, and we mean something specific and checkable by it. Before release, a tool that runs the same engine the app ships replayed a recorded solution for all 120 levels, and checked three further things about each one: that leaving the hillside alone never fills the cistern, that a straight cut from the spring or onto the cistern never fills it, and that two hundred sessions of random digging inside the same dig budget fill it less than a tenth of the time.
What that establishes is that every level can be solved, that none of them solves itself, and that none of them is solved by luck. It does not establish that the solution the tool recorded is the cheapest possible one. An exhaustive search over every dig a player could make is not a thing anyone can honestly compute, so we do not claim it, and you may well find a cut cheaper than ours.
Your progress is yours
Which levels you have cleared and your daily streak are stored on your device and nowhere else. We never see them, and we cannot restore them for you if you delete the app.
Purchases
Sluiceway is bought once from the App Store. There is no in-app purchase, no subscription, no currency, no advertising and no content behind a second payment. Every one of the 120 levels and the Daily Hillside is included in the price. Hillsides two to six open as you clear the one before them; that is pacing, and there is nothing you can pay to skip it.
Purchases and refunds are handled entirely by Apple under the Apple Media Services agreement, not by us, and we cannot issue a refund.
Acceptable use
Do not decompile, reverse engineer or redistribute the app. These are the ordinary terms; nothing unusual is intended by them.
Disclaimer and liability
Sluiceway is provided as is, without warranty of any kind. To the fullest extent permitted by law, OFO Labs is not liable for any indirect or consequential loss arising from your use of the app. Nothing in these terms limits any liability that cannot be limited under the law that applies to you.
Changes
If these terms change, the new version will appear here before the change ships.
Contact
ofolabs@gmail.com