Color Line - ferry operator - was created in 1990.
The Color Magic, sailing for Color Line between Oslo and Kiel.
Color Line Stadion was created in 2005.
No!
Yes. It is directly opposite ferry terminal.
You don't have to wait in line to cross, and the crossing is quicker. ( -But personally, I prefer ferry boats.)
You don't have to line up to get on. Travel is continuous.
20 hours, according the Norfolk Line website
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Stena Line offers both passenger and freight ferry services. The ferry serves Denmark, England, Germany, Ireland, Latvia, Northern Ireland, Norway, the Netherlands, Poland, Scotland, Sweden and Wales.
Googling "Holyhead Ferry" would have given links that show: Stenna Line: LL65 1DQ Irish Ferries: LL65 1DR
5 including the Ferry line. (-: