ðɛɹˌɑːɹ ˈɔːlsoʊ ˈɜːθkweɪks ðæt əkˈɜː dˈʊɹɹɪŋ ɡˈeɪmpleɪ ðæt wʊd ˈɔltɚ ðə tɚɹˈeɪn, sˈʌmtaɪmz ˈoʊpənɪŋ ˌʌp nˈuː ɹˈaʊts ɔːɹ ɹᵻvˈiːlɪŋ pɹˈiːviəsli ɪnæksˈɛsəbəl ˈʌpɡɹeɪdz.
There are also earthquakes that occur during gameplay that would alter the terrain, sometimes opening up new routes or revealing previously inaccessible upgrades.