The national sport of Bangladesh: Kabadi or Ha-Du-Du
The national sport of Bangladesh is neither football nor cricket, although cricket is one of the most popular games in the Country. Despite having a strong position in the world Cricket ranking, cricket failed to be the national sport there. A traditional game called Kabadi, AKA Ha-Du-Du, is the national sport in Bangladesh.
Right after the liberation of Bangladesh, in 1973 the Kabadi Federation was established. Back then its name was Bangladesh Amateur Kabadi Federation [wikipedia]
The same game was known as Ha-du-du before. In 1972, the name was changed to Kabadi and declared as the national game/sport of Bangladesh. It is now called by both of the names.
This sport has its own rules and regulations. You can read the rules in this link
If you search on YouTube, you will find a lot of videos on this Game. Here is one short clip on Kabadi.