Visitors to Guinea must obtain a visa from one of the Guinean diplomatic missions unless they come from one of the countries or territories that are visa exempt.
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Visa exemption
Citizens of the following 21 countries and territories as well as refugees and stateless persons residing in these countries can visit Guinea without a visa:
Holders of diplomatic and service passports issued to nationals of Romania and Russia do not require a visa for a stay of maximum 90 days.
Visa on Arrival
Holders of an approval letter issued by the Directeur Central de la Police de l'Air et des Frontieres can obtain a visa on arrival.
References
Visa policy of Guinea Wikipedia(Text) CC BY-SA