Nigeria won eight gold and two silver medals to clinch the title for a record 15th time.
The World Happiness Report is released annually as part of the celebration of the day.
It is an opportunity for either Egypt or Nigeria to salvage something from their campaigns at the tournament following semi-final heartbreaks.
Mail will face Senegal in the quarterfinals.
Early in the second half, both Sudan and Senegal failed to convert several chances to score again until the 77th minute.
Chelle admitted that the clash would be difficult for Nigeria but said his team would conduct its analysis after the final training session later in the evening.
Semi Ajayi opened the scoring for Nigeria in the 36th minute.
The Super Eagles will depart for Fés on Thursday for Group C clashes with Tanzania, Tunisia and Uganda, as Egypt head to Agadir for Group B ties.
Egypt and Nigeria were scheduled to clash in a tune-up game in Cairo on Sunday.
Spain remains top of the global ranking, Argentina is second, followed by France, England, and Portugal.
