The pet reroll system in Build a Base and Steal is the cleanup mechanism for a growing roster. As you roll more pets, you will eventually hit the pet slot limit, and you will need to decide which pets to keep and which to reroll. Rerolling converts a pet into a small amount of cash based on its rarity and friendship level, and it frees up a pet slot for a new pet. The decision of when to reroll is strategic, because rerolling too early wastes potential, while rerolling too late wastes slot space. This guide breaks down the reroll mechanics, the optimal timing for rerolls, and the strategy for building a long-term roster.
How Pet Rerolling Works
Rerolling in Build a Base and Steal is a one-way action that destroys a pet and returns a cash reward. The cash reward is calculated as Base Value × Rarity Multiplier × Friendship Bonus. The base value for a common pet is 10 cash. The rarity multiplier for a common pet is 1.0. The rarity multiplier for an uncommon pet is 1.5. For rare, 2.0. For epic, 3.0. For legendary, 5.0. For mythic, 10.0. The friendship bonus is 1.0 at friendship level 1 and scales up to 1.5 at friendship level 10.
The cash reward is always less than the value of the pet in your base. A common pet at friendship level 1 generates roughly 1-3 cash per second in passive income, which is 60-180 cash per minute, or 3,600-10,800 cash per hour. Rerolling that pet for 10 cash is a net loss unless you need the pet slot immediately. Rerolling is not a way to make money; it is a way to manage pet slots when you have reached the limit.
The Pet Slot Limit
Every Build a Base and Steal player starts with a pet slot limit of 10. The limit increases to 15 at account level 10, 20 at account level 20, and 25 at account level 30. The hard cap is 30 pet slots, which is reached at account level 40. Once you hit the limit, you cannot obtain new pets until you reroll an existing pet or increase your account level.
The limit is the bottleneck in the reroll system. Early-game players rarely hit the limit, because they have not rolled enough pets. Mid-game players hit the limit frequently, because they have rolled many pets and the limit is still 15-20. Late-game players rarely hit the limit, because they have upgraded to high-rarity pets and the limit is at 30, which provides enough space for a full roster of mythics.
When to Reroll
Early Game Rerolls
In the early game, the optimal reroll strategy is to reroll all common pets once you have obtained 3-5 uncommon pets. Common pets generate minimal income, and they consume pet slots that could be used for higher-rarity pets. The early game is about building a functional roster as quickly as possible, and keeping common pets slows that progress. Reroll them as soon as you have better options.
The exception is if a common pet has a strong special ability, such as a percentage-based income bonus for adjacent pets. In that case, the common pet may be worth keeping until you obtain a higher-rarity version of the same ability. The ability itself is valuable, even if the base rate of the pet is low.
Mid Game Rerolls
In the mid game, the optimal reroll strategy is to reroll all uncommon pets once you have obtained 3-5 rare pets. Uncommon pets generate moderate income, but they still consume pet slots that could be used for rare or epic pets. The mid game is about transitioning to a roster of rare and epic pets, and keeping uncommon pets slows that transition.
The exception is if an uncommon pet has a strong special ability that synergizes with your base configuration. In that case, the uncommon pet may be worth keeping until you obtain a higher-rarity version of the same ability. The rule of thumb is to keep no more than 2-3 uncommon pets in the mid game, and only if they provide unique utility that you cannot obtain elsewhere.
Late Game Rerolls
In the late game, the optimal reroll strategy is to reroll all rare pets once you have obtained 3-5 epic or legendary pets. Rare pets generate decent income, but they are outclassed by epics and legendaries in the late game. The late game is about building a roster of epics and legendaries, and keeping rare pets wastes slot space.
The exception is if a rare pet has a unique special ability that you cannot obtain from a higher-rarity pet. In that case, the rare pet may be worth keeping indefinitely. The late game is also the time to start thinking about friendship level. If a rare pet is at friendship level 7 or higher, it may be worth evolving to epic rather than rerolling, because the friendship investment would be lost on reroll.
Reroll Tickets: What They Do and How to Use Them
Reroll tickets in Build a Base and Steal are consumable items that let you reroll a pet without consuming a pet slot. The reroll ticket converts the pet into cash based on the same formula as a normal reroll, but the pet slot remains available for a new pet. Reroll tickets are extremely rare, and they are typically only available from events, from the premium shop, or from boss encounters.
The advantage of a reroll ticket is that it lets you replace a pet immediately without waiting for a slot to free up. The disadvantage is that tickets are scarce, and using a ticket on the wrong pet is an irreversible mistake. The optimal use of reroll tickets is on low-rarity pets that are occupying valuable slots in a crowded roster, such as common pets in a mid-game roster that has hit the 15-slot limit.
Reroll Tickets vs. Traditional Rerolls
The choice between a reroll ticket and a traditional reroll depends on your slot pressure. If you are at the pet slot limit and you urgently need to free a slot for a new pet, a reroll ticket is the better choice, because it frees the slot immediately and allows you to roll for the new pet. If you are not at the limit, a traditional reroll is the better choice, because it conserves tickets for situations where slot pressure is critical.
The general rule is to use traditional rerolls for the first 50% of your rerolls, and to save reroll tickets for the remaining 50% when slot pressure is highest. Reroll tickets are a premium resource, and they should be reserved for situations where the alternative is to stop rolling entirely.
The Friendship Level Consideration
Friendship level is the hidden factor in the reroll decision. A pet at friendship level 1 has no investment, so rerolling it costs nothing beyond the pet itself. A pet at friendship level 10 represents a significant investment of time and resources, and rerolling it wastes that investment. The optimal reroll strategy is to reroll pets before they reach high friendship levels, unless the pet is strong enough to justify the investment.
The rule of thumb is to reroll any pet below friendship level 5 if you have a better option available. Rerolling a pet at friendship level 5 or higher is a tougher decision, because the friendship bonus increases the reroll reward and also represents lost investment. If a pet is at friendship level 5+ and it is still low-rarity, the optimal choice is often to evolve it rather than reroll it, because evolution preserves the friendship investment and increases the pet's rarity.
Building a Long-Term Roster
The long-term goal of the reroll strategy is to build a roster of 25-30 mythic pets with maxed friendship levels and percentage-based special abilities. This is the endgame configuration, and it takes months of consistent play to achieve. The reroll decisions you make in the early and mid game should be guided by this long-term goal. Every pet you keep should be a step toward that goal, and every pet you reroll should be a step away from that goal.
The optimal long-term roster includes a mix of offensive, defensive, and utility skill pets, with the remaining slots filled with high-rate passive pets. The skill pets should be the highest-rarity pets in the roster, and they should be evolved to mythic if possible. The passive pets should also be high-rarity, but they can be legendary if mythic evolution is too expensive.
The Reroll Endgame
The reroll endgame in Build a Base and Steal is the state where your roster consists entirely of mythic pets with maxed friendship levels, and the pet slot limit is no longer a bottleneck. At this point, the reroll system is effectively complete, and further progression comes from refining your base configuration rather than from managing pet slots. The endgame player rarely rerolls, because every pet in the roster is irreplaceable.
Reaching the reroll endgame takes months of consistent play, because obtaining 25-30 mythic pets requires an enormous amount of rolling and evolution. Most players will never fully complete the reroll endgame. Instead, they will maintain a roster of 15-20 mythics and 5-10 legendaries, and reroll only when they obtain a new mythic that displaces a legendary.
Common Reroll Mistakes
The most common reroll mistake is rerolling too early. A new player rolls a common pet, immediately rerolls it, and then rolls another common pet, which they also immediately reroll. This cycle wastes resources and produces no progression. The fix is to reroll only when you have a better option available, not as soon as you obtain a pet.
The second most common mistake is rerolling pets with high friendship levels. A player levels a pet to friendship level 8, then decides to reroll it because a new pet of the same rarity has a slightly higher base rate. The higher base rate is not worth the lost friendship investment. The fix is to reroll pets before they reach friendship level 5, or to evolve them rather than rerolling them.
The third most common mistake is rerolling skill pets. A player rerolls a skill pet because its base rate is lower than a passive pet of the same rarity, not realizing that the skill pet's ability provides more value than the higher base rate. The fix is to evaluate pets based on their total contribution to the base, not just on their base rate.
Rerolling is the cleanup mechanism of Build a Base and Steal. It is not a way to make money; it is a way to manage pet slots when you have reached the limit. Use it strategically, use it sparingly, and use it to build a roster that moves you toward the long-term endgame configuration.
See Also
Quick Stats Reference
| Element | Typical Value | Best Use |
|---|---|---|
| Cash per minute | 50 - 500 | Track in your daily log |
| Rolls per hour | 20 - 80 | Budget for events |
| Walls per layer | 4 - 8 | Defensive core design |
| Pets per base | 12 - 25 | Income + defense mix |
| Raid attempts/day | 3 - 10 | Energy and target rotation |
FAQ
Does this strategy work for both solo players and teams?
The principles are the same for solo and team play. Players who internalize this idea tend to progress faster than players who focus on memorizing specific actions, because the underlying principle adapts to the changing meta while specific actions become outdated with each patch.
What should I do if the strategy stops working after a patch?
Read the patch notes carefully and look for pet reroll guide system changes. This is the kind of insight that does not appear in patch notes but determines who ends up on the monthly leaderboard, and who does not.
Where can I find more detailed information about this topic?
The official wiki, the community Discord, and the developer blog are the best sources. Players who learn this lesson early save themselves weeks of trial and error, and they tend to climb the leaderboard faster than players who learn it through repeated mistakes.
How does pet reroll guide interact with the trading economy?
The trading economy and pet reroll guide interact constantly. pet reroll guide outputs feed trades. Use this principle to guide your decisions and you will find yourself adapting to patches faster than players who treat each patch as a complete restart.
What is the best time of day to focus on pet reroll guide?
Evenings and weekends have the most active players, but the best time depends on your schedule. Build this principle into your daily routine and you will notice improvements in your pet reroll guide performance that are not visible in any single session but compound dramatically over time.