− | Something to keep in mind when avoiding engine upgrades for a long time is that you don't have to worry about [[missions]] or the hidden map bolts. For example, if you are pushing really far into the first Plains biome, you will have more bolts than you can even use by earning 1 bolt for every station successfully reached. Therefore, once you have your [[train]] maxed out, don't waste time on difficult missions or hidden bolts along the way. | + | Something to keep in mind when avoiding engine upgrades for a long time is that you don't have to worry about [[missions]] or the hidden map bolts. For example, if you are pushing really far into the first biome (Plains), you will have more bolts than you can even use by earning 1 bolt for every station successfully reached. Therefore, once you have your [[train]] maxed out, don't waste time on difficult missions or hidden bolts along the way. |