Alaska should be blue following the ballot initiative. Also I feel that green should only be MMP while proportional mixed with majoritarian should be orange.Something thrown together in a rush after being dissatisfied with the reference maps on Wikipedia: Electoral Systems in Established Democracies, 2020
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Countries are shown with reference to how elections work for their lower house (or just house) in their national legislature. Plurality require only pluralities to win (so in a three-way race, a candidate could get 34% of the vote and win). Majoritarian systems require that a candidate get at least 50% of the vote and have various methods for achieving that. Proportional systems usually have multiple winners (so, for example, in a three way race , each party may be awarded roughly a third of the elected seats).
Let me know if I made any mistakes!