Virtual Coin Gaming NV in Curaçao offered the games on its websites www.futgalaxy.nl and nl.futgamer.com, and has received a €500,000 fine.
An unnamed individual, meanwhile, has been fined €100,000.
The KSA has revealed the fines had been increased for several reasons, namely that young adults had taken part in the games of chance.
The body also noted it prioritises illegal games that specifically target Dutch customers, and that this was the case with www.futgalaxy.nl and nl.futgamer.com, with both websites using the Dutch language.
The games violated the Games of Chance Act, which stipulates that a game of chance may be offered only if a licence has been granted.
Online games of chance are prohibited in the country, with the current law stating it is not possible to apply for a licence for online games of chance.
The law is expected to change to align with the Remote Gambling Act, which will come into effect later this year.
Licences for online games of chance will be made available, but operators must meet strict conditions regarding player protection.
