Solitary Island
Rules you should know
If you’re reading this page, I’ll assume you have cleared The Lake. You should have finished enough to know everything from the Overworld, plus the following:
And (Lake 01 and 02)
Move (Lake 03)
Open and Shut (Lake 06, 07, and 10)
Transformations (Lake 08 and 09)
How to create two statements with one noun (Lake 05). This should also apply to making two statements with one property.
If any of the rules don’t make sense, revisit the appropriate levels.
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Solitary Island
Now that you have a choice to go
Initial Solitary Island Map
To clear this world, you need to clear 8 of the 18 levels. I recommend finishing through level 10. Levels 11-12 are a bit tricky so you might want to come back later. The extra levels are just that - extra. However, a few of them are easy pickings, like extras 1 and 2.
The green levels teach you about Float, and the red ones give you more info on Move.
Note that the order of the levels in this world have moved around a lot since the game was first released. At this point the order printed here should be the settled, correct order.
Remember that hints are invisible until the text is highlighted. Bold text discusses the rules. Italic text discusses all objects of the named type. Regular text discusses the actual instances. Text “in quotes” refers to the actual text in the level.
Solitary Island 00: Poem

難易度: ☆☆
01: Float

難易度: ☆
新物件:property Float.
Look at how Baba seems to Float in mid-air. Try floating over the Walls, the Rocks, and the Flag. Does everything work the same way? Some things don’t seem to apply to an object with Float, but others do. Can you determine what that specific thing is?
02: Warm River

難易度: ☆☆
03: Bridge Building

難易度: ☆
新物件:noun Text.
That’s right, you can even manipulate the rules applying to Text. It seems that Text is Push is always active, but other rules can be added on. Text is Float is a common one.
04: Bridge Building?

難易度: ☆
Levels which look like a previous puzzle with one small difference are often solved entirely differently. How to discover that solution is to look at exactly what has changed. That change is the key.
05: Victory Spring

難易度: ☆
新物件:noun Cog.
06: Assembly Team

難易度: ☆
新物件:noun Robot and Pipe. Should be obvious which is which.
07: Catch the Thief!

難易度: ☆☆
08: Tiny Pond

難易度: ☆☆☆☆
This is a tricky one, but don’t skip it. You’re going to want to know the tricks you’ll learn from this level.
09: Research Facility

難易度: ☆☆☆
新物件:noun Bolt
10: Wireless Connection

難易度: ☆☆☆
新物件:noun Bog - like Water and Lava, another liquid obstacle, this time puke green.
11: Prison

難易度: ☆☆☆☆☆
This level was added to the game after the initial release. Before, a different level stood in its place, but apparently the trick was too difficult and so this level was added to help ease you into learning the trick. If it’s too difficult for you now, feel free to come back later. It is not necessary to learn it to get the normal ending of the game.
Extra 1: Boiling River

難易度: ☆☆
Based on Island 02. The solution for this level is something you can actually do in Island 02, but it’s likely you didn’t notice it. You’re going to have to notice it now.
Extra 2: Bridges?

難易度: ☆☆
Based on Island 03 and Island 04. Similar puzzle, wildly different solution from the other two.
Extra 3: Tiny Isle

難易度: ☆☆☆☆☆
Similar to Island 08. The solution to this extra level is possible in the original one, but it’s likely you didn’t think of it then.
Extra 4: Dim Signal

難易度: ☆☆
新物件:noun Ice. We’ve seen actual tiles of Ice in other levels, but this is the first time we see the word… and there’s no actual tiles of Ice in the level.
You’ll notice I gave this level fewer difficulty stars than Island 10. That’s because I believe the logical leap required to solve this one is not as large, once you already know the solution to Island 10. Sometimes extra levels are like that, but not often. Enjoy the break from the tough levels.
Extra 5: Dungeon

難易度: ☆☆
Yes, the difficulty rating is correct. If you solved Island 11, the logical leap needed to solve this one is small.
Extra 6: Evaporating River

難易度: ☆☆☆☆☆
Similar to Island 02 and Island Extra 01, but with a greater twist.
World Complete!
Once you clear this world, two paths open to you. The upper path leads to the third world, Temple Ruins. The lower path leads to the fourth world, Forest of Fall. While you can certainly clear the later worlds in whichever order you like, I really don’t recommend trying to do these two out of order. You need to understand the concepts from the Ruins in order to get through Forest of Fall. Not only that, but the Ruins is much, much easier.
In the meantime, do these hints work? Anything spoil too much? Do the hints actually help or are they too vague? Maybe you thought of a really good hint yourself? Send them to me. (Don’t comment them below.) You can find me @keyofw on Twitter or keyofw on Reddit. DM me anytime.