Addressed many issues:

1. Fixed color of stats, position of HUD items.
2. flicker issue:
> must use GDI+ instead of picturebox controls
http://www.devcity.net/Articles/44/1/gdiplus_tetris.aspx

3. Compress interface for more screen space?
> I’m thinking, just make single click move and double click attack. I figured out how to add double click-enabled button (see Double Click Test button).
https://social.msdn.microsoft.com/Forums/vstudio/en-US/e267047b-7653-472a-afd0-d9a6051cec17/enable-double-click-on-button-with-image-background

However, It gets canceled out by Single Click. So I have to add event timer to distinguish:
http://msdn.microsoft.com/en-us/library/ms171543(v=vs.110).aspx

Still working on double/single click event timer.