A rough overview on tier progression in the game.
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Note that this brief general guide will be extremely generalized. In other words, there are so many ways to play the game and progress, and everyone’s Tower is unique, so this is by no means stating that what is covered here is, or should be, the optimized path for all!
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Starting out with the game in Tier 1, you may opt for a Turtle build initially and work your way up longer wave lengths. If you’re new to the game, you may also want to check out resources, such as: Beginners, start here! 👋. Generally speaking you will farm Tier 1 until you are able to earn more coins daily/hourly on Tier 3. However, don’t forget to occasionally push your milestones at higher tiers so that you earn more from daily missions and receive new unlocks, gems, stones along the way.
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In general, for Tier 2-10, it is usually recommended to move on to the next tier when you can consistently farm your current tier to wave 5,000+ (withℹ️Coin Trade-off Perk). However, please note that there are many exceptions to this - including considering whatever best fits your schedule, unique strategies, etc.
Moreover, please note that most players will largely skip Tier 2 altogether, except getting the rewards for the milestones. This is because Tier 2 is a huge difficulty increase from tier 1, but where Tier 3 is not a lot more difficult than Tier 2 and gives better coins.
At this point, while you could push a Turtle build somewhat beyond Tier 1, you will likely transition to a regular Blender build. And, you may eventually consider an Orb Devo build for increased coin gains (but which requires more monitoring of the gameplay).
While you may progress somewhat quickly from Tier 3 to Tier 10, Tier 10 itself is a tier that you generally will stay at for a long time. It likely will stay the most efficient tier for you until you can do closer to 10k waves.
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Tier 11 is another tier that you generally will stay at for considerable time. It likely will stay the most efficient farming tier for you until you can do about 9.5k waves - particularly if you are farming as Effective Health (eHP).
At this stage of the game, you may also have Ultimate Weapons and Modules developed in such a way that various Orbless and free-up strategies becomes viable and your preferred method of farming.
Other Resources: