CSO Mega Bonus is a special event in Counter-Strike Online. In every CSO Mega Bonus always held a giveaway weapon PERMANENTLY if the player log-in during the event periods.
- Indonesia: 11 September 2013.
- Taiwan/Hong Kong: 9 April 2014.
List of Mega Bonuses
- 10,13,14 April 2013: Get permanent QBZ-95B upon first login during event.
- 11 ~ 14 September 2013: Get permanent PKM upon first login during event.
- 23 ~ 26 October 2013: Get permanent King Cobra upon first login during event.
- 10 December 2014 ~ 7 January 2015: Get permanent PSG-1 upon first login during event.
- Taiwan/Hong Kong
- 9 April 2014: Get permanent TAR-21 after continuous login for 10 days and complete 1200 minutes of gameplay each day (requires 4 players and above).
- Most of the weapons given are cash weapons (ex: King Cobra and PKM).
- During the QBZ-95B giveaway in Indonesia region, there is a bug where the players are able to receive up to 3 units of QBZ-95B, one per day.
- There is a bug in Taiwan/Hong Kong region where the players can receive more than 1 unit of TAR-21 if they login more than once a day. This bug was fixed on 25 April 2014 and the other TAR-21s in barrack have been removed automatically.