lisätäalusdatapelin
lisätäalusdatapelin is a term that appears to be a compound word in Finnish. Breaking it down, "lisätä" means "to add" or "to increase". "Alus" can translate to "ship", "vessel", or "base". "Data" is "data". Finally, "pelin" is the genitive case of "peli", meaning "game". Therefore, a literal translation could be "additional ship data game" or "base data addition game".
The exact meaning and context of "lisätäalusdatapelin" are unclear without further information. It is possible it
If it pertains to a game, it might describe a mode where players can add data about