Hey, I try to update my old version 0 of Domino Fall Chain Reactions, but why I only got Export button (without "(update)")? As result, this version 1 is published as a new scenario. So, I'll delete my old version 0 from Greenfoot Gallery.

Did you change the title? That might've been what confused it. Nice preset formations! Only thing that I'm noticing now is that some of the dominoes (in the middle row of the default formation) seem to fall instantaneously rather than gradually... good apart from that though!

Aaah... yes, I did change the title a little bit :P. About the instantaneous fall, its a known bug, strike from the last piece you put is usually better than strike from the reverse end. I dont know yet where is the problem, could be some math calculations is slower than the other? or could be the way Greenfoot draw objects on the World (the draw order of object over or under the other object)?

Nice update! If you want to take it a bit further you could make the animation of the falling dominoes smoother (i.e. show the domino falling gradually rather than in one step.) It shouldn't be too difficult to do, just stretching the image's height from 0 pixels to full size may well prove enough of an illusion :)

I think there's only one button on a mac ;) ...but on proper laptops (I'm going to get slaughtered for saying that :P), there's still usually only two :P

ONE button? :O (sorry, I know nothing about mac) But I think Ninto use the "proper" mac :D , so I'll stick with my plan :)

If you hold a button down and click I think that's the same as a right click, so it's possible, but as far as I know there's just one button. Apparantly the apple engineers tried to squeeze two on but just couldn't do it!* *Not really true of course, I just have a bad habit of making even worse mac jokes ;)

Adding some new objects: magic Resetter button (now we can have perpetual motions :D), LightBulb (for new toppling tricks, not complete yet). Testing GUI & Formation Editor (not complete yet & some functions not works yet, I'm still learning java swing :P).