"Baba is You" by Hempuli Oy is a puzzle game where you have to get your character to the goal of each level.
It's generally a box push puzzle but with a twist: You can change the rules of the level by pushing them around. So you can change the rules in some levels that way that e.g. a boulder becomes the goal etc.
It seems like an interesting idea to me, especially since it allows you to "reprogram" the level, which needs other thinking than a mere box push puzzle.
I only played some of the levels so far, but even in the beginning there were some tough ones for me.
I personally like the idea behind the game since it has programming aspects without need to know programming languages.

(Quite some time ago I came across of a Java based game (forgot the name) where you had to change the rules to get to the exit. It really needed you to get into the programming language, which had its good and bad sides. Baba is you is in the same spirit but non-programmer friendlier and integrates the rules into the box puzzle game mechanics.)

Replays to (culled levels):

Excavation
Escape the Pit (different version)

Some further replays to culled levels. I think there are some backroutes.

Castle in the Sky
Four Color Circus
Heavenly skies
It's All Uphill From Here
Laser Deathroom (Part 2)
Leap of the Locust
Lixology
Over the Hump
The Giant Mushroom
Top Gear

Edit: Attached another replay to Bulldozer, which is closer to intended.

Quote from: Forestidia86 on May 28, 2018, 03:36:49 pm

To copying pieces:

That copied pieces spawn a bit below the original can lead to the problem that they spawn outside of the reachable map if the original is too low on the screen edge. You can still reach them by increasing the lower map size though.

One idea against that problem would be that tiles are spawned above the original tile iff they would end up below the map border.

I think this issue is still not in github but it came up again in IRC:

16:20:12]    <Ramond__> maybe an editor suggestion
[16:20:30]    <Ramond__> cloning tiles that are aligned to the bottom of the map should not clone downwards, only sidewards
[16:21:15]    <SimonN> right
[16:21:39]    <Ramond__> perhaps something analogous for right-bound tiles
[16:22:08]    <SimonN> if things would clone to outside of the map, they should clone in the opposite direction.
[16:22:18]    <Ramond__> yeah something like that
[16:23:20]    <SimonN> Also game should remember where you moved after cloning, and clone the next stuff again in that direciton.
[16:24:55]    <SimonN> To aid building long walls/floors from a sequence of the same tiles
[16:25:16]    <Ramond__> makes sense
[16:25:57]    <SimonN> Do you have a github account? You can file issues directly there. Otherwise I'll file it once I remember it. It's also dug in a thread on LF.

Attached replays to:

"Bulldozer"
"When the Levee Breaks"
"Digging in the Air" (probably not fully intended but main trick is in there)

I have a rough adaptation to Pinnacle of Defeat. It should cull some backroutes but still can have some.
The "intended" solution in this version is in the spirit of mobius' idea but very finnicky to perform.

Quote from: Simon on January 11, 2019, 12:32:43 am

Lix has a level that solves with 0 skills, but not obviously. Thus Forestidia's 3) is a concern: Cancelling the map produces a solution checkmark, that would look like a bug.

Color me curious, which level?  Is it part of the set of levels that come with Lix or just a custom one from somebody?

The other alternative is maybe the game just always keep the replay for the most recent attempt as a backup somewhere, regardless of whether it can possibly solve or has solved the level or not.

I like the idea of having a backup save replay, although you can save replay manually after exiting the level.

A bit aesthetically improved version of "Time is Running Out".