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Slot machines can have fairly complex behaviour. Determining the RTP (return to player) can be involved, especially when a player has an influence on the course of the game. In this paper we model the behaviour of slot machines using probabilistic process specifications where the intervention of players is modelled using non-determinism. The RTP is formulated as a quantitative modal formula which can be evaluated fully automatically on the behavioural specifications of these slot machines. We apply the method on an actual slot machine provided by the company Err\`el Industries B.V. The most useful contribution of this paper is that we show how to describe the behaviour of slot machines both concisely and unequivocally. Using quantitative modal logics there is an extra bonus, as we can quite easily provide valuable insights by a.o. computing the exact RTP and obtaining the optimal player strategies.
Groote et al. (Tue,) studied this question.