How long does the SpaceChem demo last

On the 29th of April 2011 the game received an update.

Among other changes, all the 12 challenges previously only visible in the game, are now also visible Steam achievements, and there are an additional 3 achievements related to a TF2 tie-in.

This accounts for all 15 previously "empty" achievements on Steam.

Additionally, I was awarded Steam achievements for each completed Challenge without having to re-complete them, but I'm not sure of the mechanics in operation here to know how this is managed.

Simple. First, make sure there is nothing on the blue waldo, this would only get in the way. Then:

1. Select the whole red waldo path.
2. Use ctrl+drag to copy the entire red waldo path.
3. Then right click the result, and click blue layer.
4. Move the entire thing to the right location.

Make sure not to deselect the parts between step 2 and 3, as the correct stuff is already selected. Also, if the red path covers the entire screen, this will be a lot harder. Do it in steps and add parts manual where needed. Using shortcuts to place commands is quick too.

Edit: If red covers 100% screen, there is still a way to copy half of it into blue like this:

1. Select half the screen.
2. Right click it and select blue layer.
3. ctrl+drag the blue layer to the other half of the screen.
4. Select the original half again and right click to make it red.
5. Either hide or lock red by clicking in the lower right at layer controls.
6. Move the blue part back to the original location.
7. Repeat with half of the remaining half.