Era milestone
Cenozoic Era (horses)
Badge: 'YOU UNLOCKED HORSES!' — 2,578,411 awards, ~71% of joiners. First animal family; poop income with golden-drop rolls.
Clean the WORLD! Tier List & Ranking Data
No S/A/B upgrade tiers exist for Clean the WORLD! — the game publishes no stats and no community wiki measures them. What does exist is better than a guess: official badge award counts that rank the progression itself. Checked 2026-10-17.
Quick answer: what we can rank today
Badge award counts double as a progression funnel. Of roughly 3.6M players who joined, about 71% reached the horse era, 64% the mythological creatures, 58% the gorilla era, 46% the dinosaur era, and 27% unlocked the SEA. Only about 14% have rebirthed. The drop-off between dinosaurs and SEA is the single biggest wall in the game — it is where the gum grind bites, because the SEA entry was documented at 1,000,000 gum.
| Rank by difficulty (hardest last) | Share of joiners | Badge awards |
|---|---|---|
| First rebirth | ~14% of joiners | 504,295 |
| SEA unlocked | ~27% of joiners | 985,177 |
| Mesozoic Era (dinosaurs) | ~46% of joiners | 1,683,872 |
| Miocene Epoch (gorillas) | ~58% of joiners | 2,115,489 |
| Mythological Creatures | ~64% of joiners | 2,324,764 |
| Cenozoic Era (horses) | ~71% of joiners | 2,578,411 |
| Join (WELCOME) | 100% baseline | 3,636,487 |
Source: Official (badges.roblox.com API, universe 10494847029 — award counts checked 2026-10-17 (unchanged from the 2026-10-09 reading); win rates checked 2026-10-03, masked on the 2026-10-09 and 2026-10-17 rechecks). Percentages are computed from badge award counts against WELCOME awards — they measure how far the player base has ever gotten, not a per-player completion rate.
Every rankable entity, grouped
Filter by group: era milestones carry award-count evidence; current-update context explains what PRESTIGE changed; named-but-undocumented features explain why some rows have no ranking at all.
Era milestone
Mythological Creatures (unicorns)
2,324,764 awards, ~64% of joiners. Rare unicorn rolls inside the horse population's upgrade block.
Era milestone
Miocene Epoch Era (gorillas)
Badge: 'THE GORILLAS ARE TAKING OVER' — 2,115,489 awards, ~58% of joiners. Banana economy with triple/quadruple tiers.
Era milestone
Mesozoic Era (dinosaurs)
Badge: 'is that... DINOSAURRS!?' — 1,683,872 awards, ~46% of joiners. Eggs become the top income line.
Chapter milestone
SEA unlock
Badge: 'You unlocked the SEA!' — 985,177 awards, ~27% of joiners, 71.8% win rate. The game's first grind wall (~1,000,000 gum documented).
Endgame milestone
First rebirth (TIME TRAVELER)
Badge: 'REBIRTH FOR THE FIRST TIME' — 504,295 awards, 32.6% win rate. Rarest earned award; ~14% of joiners.
Current update
PRESTIGE economy
All Robux upgrades obtainable free-to-play since 2026-09-27 — removes the pay-to-win shortcut from any ranking conversation.
Not released
Outer Space (Chapter 4)
Badge exists with 0 awards; announcement teaser only. Not eligible for ranking.
Named, undocumented
Shredder
Official SEA feature name with no published function or stats. Not rankable.
Named, undocumented
Seagulls
Official SEA feature name with no published behavior. Not rankable.
The animal families, by documented position
A defensible partial ordering exists for the four animal families because their skill-tree positions are sequential in documented play — each family's income line replaces the previous one:
- Horses (Cenozoic Era) — Poop: Poop income x2, more horses, horses pooping twice (20% chance), poop value tiers. Jackpot roll: Golden poop ~2% chance at 100x value; neon poop; diamond 'pure carbon' poop.
- Unicorns (Mythological Creatures) — Poop (upgraded lines): Unicorn chance (2% observed), rainbow horses described as bright reskins. Jackpot roll: Unicorns as a rare horse-population roll.
- Gorillas (Miocene Epoch Era) — Banana peels: Banana value, triple bananas, quadruple bananas, double-thrown bananas (100% chance observed at max). Jackpot roll: Golden bananas (15% chance observed at max tier) worth 100,000x.
- Dinosaurs (Mesozoic Era) — Eggs: Egg income (~123,000 per egg observed), double eggs (20% chance), egg value. Jackpot roll: Diamond egg ~0.05% chance observed.
Read that as a power ladder with a documented caveat: it orders when families arrive, not their measured per-minute income. No source publishes comparable rates, and the PRESTIGE rebalance (September 27, 2026) plus the rebirth system (August 25, 2026) can shift the math underneath any snapshot.
Source: Creators (LITTY, 2026-08-21).
What a real tier list needs
Four inputs, none public today: an upgrade table with costs and effects per level (the game shows prices in-client but no source has tabulated them); version context that survives patches — PRESTIGE alone rebalanced the whole shop; repeatable tests — measured gum or cash per minute at a fixed upgrade state, run the same way by multiple players; and rebirth interactions, since what a reset preserves decides whether late-tree investments stay worthwhile. When any of those surfaces, this page becomes a real tier list; until then, the funnel above is the honest ceiling.
Questions players ask
Is there a verified Clean the WORLD! tier list?
No — for upgrades, animals, or boosts. The developer publishes no stats, and no community wiki exists to collect player-measured numbers. What this page ranks instead is the progression itself, using official badge award counts.
What is actually the best animal family?
Documented play points to dinosaurs as the top income line by position — eggs arrive last and their value upgrades are the priciest — but no source provides comparable per-minute numbers, so 'best' remains an observation, not a measured ranking.
Which milestone is the hardest?
The badge data answers this one objectively: the SEA unlock (71.8% win rate, ~700,000-player drop-off from dinosaurs) is the hardest pre-rebirth milestone, and TIME TRAVELER (32.6%) is the hardest overall.
What would make a real tier list possible?
Four inputs: a published (or community-measured) upgrade table with costs and effects, fixed version context, repeatable income tests, and rebirth interactions. None exist publicly as of October 2026.
Why don't you copy a tier list from another game?
Same-name search results surface a different CLEAN THE WORLD game (Chaseroony, place 71200972953378). Its items and tiers belong to a different game and would be wrong here.