One Line Letters and Codes

You have just received a coded love letter! In this minimalist puzzle, you will have to draw a single line to fill the entire board. At each level solved, get a code to reveal a piece of the letter. Gather the codes, read the letter and discover the message.




Minimum:
OS: Windows 7/8/10
Processor: 2 Ghz Dual Core
Memory: 4 GB RAM
Graphics: Graphics card supporting DirectX 9.0c
DirectX: Version 9.0c
Storage: 300 MB available space
Sound Card: Any

Recommended:
N/A