Exact(26)
This is a simple puzzle with a lot to explore.
For a "simple" puzzle it is surprisingly brain-muddling!
Why did Gas Stations, which was also a simple puzzle, generate so much more discussion?
The easiest way to see this is to consider a simple puzzle called the "inverted spectrum".
A month might seem like a long time to solve a simple puzzle, and it is.
A simple puzzle game remains at the top of the charts for free iPhone apps this week.
Similar(33)
Eventually, they found that playtesters enjoyed a rather simple puzzle with a countdown timer near the end; Swift noted, "Time pressure makes people think something is a lot more complicated than it really is", and Wolpaw admitted, "It was really cheap to make [the neurotoxin gas]" in order to simplify the dialogue during the battle.
They determined that if she had been looking at the road, "the driver in this case could have reacted and brought the vehicle to rest 42.61 feet prior to the pedestrian". What flummoxed the Uber computer is a relatively simple puzzle for an experienced and alert driver.
Now, it is much more likely to involve challenging a friend to Scrabble or matching wits with the computer in a relatively simple puzzle.
So, in both cases, it appears to be a very simple puzzle, because the group just consists of two loops.
Pullblox was a deceptively simple puzzle game for Nintendo's handheld 3DS, its plump little hero walking up to irregularly shaped blocks and either pulling them forwards or pushing them backwards in order to form stairs towards a flag perched at the top of each puzzle.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com