As far as I could see in their promotion page their only welcome bonus is a first deposit bonus of 100% match. The bonus isn't automatical, you need to enter a code when depositing. I really liked the fact that the minimum deposit in this casino is only 1€, so you can play there even with the leftovers you have in your ewallet. Minimum deposit to get welcome bonus is 10€ and maximum is 400€. When I made the deposit of 10€, I entered the bonus code and received bonus right after deposit. I was happy about it since I had no need to contact support.
Their cashier and lobby overall is easy to navigate and in the cashier I saw my wagering. The rollover for this bonus is 24x deposit+ bonus which I consider to be a good offer. Having 20€ balance I had to wager 480€.
My favorite game from Merkur software is Dragon's Treasures because it can produce many 100x bet winnings and more. For this bonus all slots count 100% and other games count less, so I didn't need to ask support which games I could play, that made my life easier too. I had a long session with this game, I had a few 100x bet winnings, once even 200x bet win on base game. At some point after such big win I increased bets and played with 0.25€ for a while, but it ended up with me losing most of my balance. Later a dry run came and I lost all.
Overall I had a great time and this bonus had a big part in that. This is a good offer with reasonable wagering and I think it can help to explore their games. The game selection isn't very large but at the same time all of their games are one of a kind. I do recommend this bonus.