Well the current one is okay, but it seems you can have only 1 layout per game. Look at Zelda, it's not 1 layouts it's multiple layouts that just seem seamless.
If any of you have used Game Maker you will will know what I'm talking about.
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Go to the project tab right click add layout. You can have as many layouts and event sheets as you want. Have you tried any of the tutorials around? I would start with some of them.
Deadeyes Platform School
Ghost Shooter Tutorial
Tutorial wiki page
If you go through these and still have questions post in the Help/Tech Support or Join us on theChat. The people there will be able to quickly answer any questions you have.
OH, I didn't know you could have unlimited tiles.
Also remember, I joined ages ago when Construct was still being discovered.
The layouts are not tiles. The layouts are like your "Levels".
I meant to say layouts, got excited a bit there.