Why a short chess puzzle works better than a screen-time timer

You pick up your phone to check the weather. Twelve minutes later you’re watching a stranger renovate a kitchen in a city you’ll never visit, and the weather app is still closed.

If that sounds familiar, it isn’t a lack of willpower. It’s design. The apps that pull us in are built so that nothing stands between the urge and the feed: one tap, no question, already playing. Your thumb gets there before you’ve had a single thought about it.

So the question we kept asking while building TacticLock was a simple one. What is the smallest thing you could put in that gap, so that you get there first?

Habits run on ease

Psychologist Wendy Wood has spent decades studying habits at the University of Southern California. Her work keeps coming back to the same unglamorous finding: we do what’s easy, far more often than we do what we intend. Willpower is a tiring, unreliable tool. Changing the setting around a habit works much better.

Her advice for an unwanted habit is to add friction. Make the thing a little harder to do, and you do it less, without having to fight yourself every time. Phones, she has pointed out, have had almost all of their friction designed away. Putting a little of it back is how you take control again.

That idea is the whole starting point. Not a wall. Just a step.

What happens when you add one small pause

In 2023, researchers published a study in PNAS, one of the major science journals, on an app called one sec. It does one thing: when you open an app you’ve chosen, it shows a short pause of about ten seconds, then asks if you still want to go in, with an easy way to back out.

Two things in that study stayed with us. First, the most effective part wasn’t the waiting. It was simply being offered a way out. People didn’t need to be blocked; they needed a moment to notice what they were doing. Second, the researchers found that using your phone on autopilot went together with lower quality of life. The mindless part is the problem, not the phone.

Less scrolling, better mood

A few years earlier, a team at the University of Pennsylvania led by Melissa Hunt ran one of the first experiments to test what cutting back actually does. They asked 143 students to limit Facebook, Instagram and Snapchat to ten minutes each per day, for three weeks, while a second group carried on as usual.

The group that cut back reported less loneliness and less depression. The change was biggest for the students who felt worst at the start. Hunt was clear that this isn’t a case for quitting. Her takeaway was gentler: “put your phone down and be with the people in your life.”

Why we didn’t build another timer

Most screen-time tools use a timer. You get a limit, the limit runs out, and a grey screen tells you to stop. We’ve all learned what to do with that screen. You tap “ignore limit” without reading it, the same way you close a cookie banner.

A timer only asks you to wait. A puzzle asks you to think.

That difference matters. Looking at a chess position, even a simple one, needs your attention: whose move is it, what’s attacked, what’s the one move that works? For those few seconds you’re not reacting any more. You’re choosing. And when the puzzle is done, the choice is genuinely yours. Open the app for your break, or put the phone down. Either is fine.

There’s a quieter bonus too. A timer leaves you exactly where you started. A puzzle leaves you a tiny bit better at something. Do that a few times a day for a month, and the minutes you would have lost to the feed add up to something you actually learned. We like to call it a micro-learning pause.

And because a pause should never become a trap, emergency access in TacticLock is always one tap away, with no puzzle and no limit. Calls, messages and maps stay open by default.

What we want to be honest about

None of the studies above tested TacticLock. They tested pauses and limits in general, and we built on what they found. We haven’t run our own study yet, and we’d rather tell you that than dress up a guess as a fact.

You also don’t need our app to start. A few small changes add friction on their own:

• Move the app. Take your most-scrolled app off the home screen and put it in a folder on the last page.
• Turn on grayscale. A black-and-white screen makes the feed far less tempting.
• Swap the reflex. Put something with an end point where your thumb lands: one puzzle, one lesson, one saved article.

If you want the pause to happen on its own, and to get a little sharper each time, that’s what we made TacticLock for.

Make a move first. Then scroll, if you still want to.