Kassu "kassu43" Kassu is known to be one of the best Counter-Strike: Global Offensive players in the world. Despite being first known as a paramount rifler, he began to showcase his amazing potential with the sniper rifles in Ezkärry Gaming and Havu Gaming.

In mid-September 2014, Kassu saw his career elevated to new heights as he signed for HellRaisers, joining stars like Dosia and markeloff.[1] During this time in HellRaisers, Kassu started making waves internationally, most notably at DreamHack Winter 2014, where his team beat fnatic in the group stage, 16-14, leading to a top placement in their group. However, their run at the event ended in the quarter-finals, as they were dominantly beaten by Ninjas in Pyjamas, losing the series 2-0.

Just a few weeks later, it was announced that kassu was going to stand in for his former team, HellRaisers, which had been looking for a fifth player after the surprising departure of Dosia.[2] Two weeks later, HellRaisers attended DreamHack Stockholm 2015, which was a qualifier for the upcoming Major, DreamHack Cluj-Napoca 2015. The team failed to qualify despite being a big favorite for a Major spot, as they lost to Titan eSports 1-2 in the winners' match, and were then upset 1-2 by Vexed Gaming, a team which they had defeated 2-0 a day earlier in the tournament.

Kassu became good friends with Mar7ti and keitz when the latter was playing as a stand-in for Ezkärry Tactics, which would later lead to him recruiting Kassu to Team Liquid, a move that meant Kassu had to sacrifice his university course in the process. Team Liquid, with Kassu and Mar7ti, would go on to make it to the semi-finals of MLG Major Championship: Columbus 2016. At the same Major, Kassuwas chosen for the NA vs EU All-Star Game on the NA side, which would go on to win the match in overtime. kassu was awarded the All-Star MVP.

In August 2016, he joined the Finnish team Ence Esports, replacing Miikka "SuNny" Kemppi. Although Kassu was very happy to fulfil his long-time dream of playing in Ence Esports ranks, the team's initial results were disappointing. After a series of failures, the team took home the trophy at ESL One New York 2016, but this was to be the last big victory for this roster. After a long period of re-shuffles, which saw long-time Ence Esports players Sergej and Aerial replaced by a returning Keitz and rising young star Mar7ti, the team was able to find success, and quickly rise in the HLTV team ratings. This new line-up led to notable victories, such as StarSeries & i-League CS:GO Season 5, CS:GO Asia Championships 2018, ESL One: Cologne 2018 and others.

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