Celebrity Cruises is encouraging agents to enter an interactive challenge as it celebrate its “biggest-ever” season of European sailings this summer.

As part of its Journey WonderFULL campaign, the cruise line has created the ‘Find the X Challenge’ where participants are tasked with examining five photographs and uncovering a hidden X containing a code in each.

Those who find all five codes by February 9 will be entered into a prize draw to win a seven-night European sailing of their choice for two people on an all-inclusive basis including flights.

The five photographs are of destinations passengers can visit on a Celebrity cruise, including Dubrovnik, Florence, Santorini, Barcelona and Athens.

Jo Rzymowska, managing director of Celebrity Cruises EMEA, said: “We are thrilled to announce the launch of this new interactive challenge which brings to life some of the stunning destinations we sail to in Europe as well as giving away an incredible luxury cruise holiday for two to a lucky winner.

“We wanted something which allowed in-depth discovery of the places our ships visit during their sailings, and the images highlight the unique beauty and charm of these magnificent cities and give a small glimpse into just what you can discover when you travel with us.”