Is Boo (Kid) OP in ASTD? Complete March 2026 Guide & Analysis
I’ve been absolutely obsessed with collecting and testing every unit in All Star Tower Defense, and when Boo (Kid) dropped during Star Pass Season 5, the entire community went wild. As someone who’s spent hundreds of hours perfecting my ASTD strategies, I can confidently say that Boo (Kid) isn’t just overpowered – he’s a complete game-changer that redefined the meta.
If you’re wondering whether to invest your resources into evolving this pink powerhouse or searching for him in trades, I’m here to break down exactly why Boo (Kid) remains one of the most sought-after units in ASTD, even though he’s currently unobtainable through normal means.
Quick Answer: Yes, Boo (Kid) is Absolutely OP
Boo (Kid), such as he appears in All Star Tower Defense, is a very OP character. He is a 7-star unit character, and if we judge the current meta, he is now the best unit to give health to the base at once, winning the spot from Killer S+.
But let me show you exactly why he’s worth every gem and evolution material you can throw at him.
Roblox ASTD Boo (Kid) Key Stats & Abilities Overview
| Attribute | Details |
|---|---|
| Rarity | 7-Star |
| Attack Type | AoE (Cone) → AoE (Full) → AoE (Circle) |
| Base Damage | 5,000 → 2,660,000 |
| Deployment Cost | 15,000 |
| Special Abilities | Candy Beam (6.5s Timestop) → Sleep (5B HP Base Heal) |
| Leader Skill | Pure Evil units gain +20% attack & +15% bonus |
| Categories | Depraved Demons, Godlike Power, Unworldly Beings, Pure Evil, Final Bosses, Revival |
Why Boo (Kid) Dominates the All Star Tower Defense Meta?
1. Best Time-Stop Ability in the Game
Boo (Kid) is also the best time-stopper unit in the entire game, having a larger range and longer duration than even Mysterious X (VOID). His Candy Beam ability freezes all enemies in range for an incredible 6.5 seconds with only a 45-second cooldown.
To put this in perspective, Mysterious X – one of the most popular time-stop units – only manages 5.7 seconds. That extra 0.8 seconds might not sound like much, but in high-level play, it’s the difference between victory and defeat.
2. Insane Base Healing Capability
When activated, Boo (Kid) adds an extra 5 billion HP to the base. This Sleep ability (which replaces Candy Beam at upgrade 6) makes him the second most base healing in the game, only beaten by Patchface (Transfigured).
For infinite mode players, this healing is absolutely crucial. I’ve personally survived waves that would’ve destroyed my base thanks to Boo (Kid)’s clutch healing.
3. Devastating Damage Scaling
Starting at just 5,000 damage, Boo (Kid) scales up to an astronomical 2,660,000 base damage at max level. With the Skeleton (Artist) buff active, his damage reaches:
- Level 1: 81,396
- Level 175: 19,942,020
That’s not a typo – nearly 20 million damage with proper buffs!
4. Incredible Attack Type Evolution
Unlike most units that stick to one attack pattern, Boo (Kid) evolves through three different attack types:
- Stage 1-2: AoE Cone (great for lanes)
- Stage 3-5: AoE Full (hits everything on screen)
- Stage 6: AoE Circle (massive area coverage)
This versatility means he adapts to any map layout perfectly.
How to Get Boo (Kid) in All Star Tower Defense?
Here’s the tough news: Boo (Kid) has been unobtainable since Update 40.1 as it was a part of Star Pass Season 5. However, you still have options:
Evolution Path (Historical Method)
To get Boo (Kid) in ASTD, you must evolve him from two consecutive Boo iterations, starting from Boo (Mind) and then onto Boo (Evil).
The complete evolution chain:
- Boo (Mind) (5-star from Tier 1 Ultra Pass)
- Boo (Evil) (6-star evolution)
- Boo (Kid) (7-star final form)
Required materials for final evolution:
- 1x Boo (Evil)
- 1x BuuEvolve2
Current Methods to Obtain
Since direct summoning isn’t possible:
- Trading – Your best bet is finding players willing to trade
- Wait for Re-release – Developers occasionally bring back limited units
- Check ASTD codes – Sometimes special events include legacy units
Boo (Kid) vs Other Meta Units
Time-Stop Comparison
| Unit | Time-Stop Duration | Range | Cooldown |
|---|---|---|---|
| Boo (Kid) | 6.5 seconds | 40-48 | 45 seconds |
| Mysterious X (VOID) | 5.7 seconds | Variable | 80 seconds |
| Flare Lord (Serious) | 8 seconds | Limited | 90 seconds |
While Flare Lord has a longer duration, Boo (Kid)’s superior range and shorter cooldown make him more practical.
Base Healing Comparison
| Unit | Base HP Added | Additional Effects |
|---|---|---|
| Patchface (Transfigured) | Higher than 5B | Passive healing |
| Boo (Kid) | 5 Billion | Instant burst heal |
| Killer S+ | ~3 Billion | Gradual healing |
Optimal Boo (Kid) Build & Strategy
Best Placement Strategies
- Early Waves: Place centrally for maximum cone coverage
- Mid-Game: Position where paths converge for full AoE benefit
- Late Game: Reserve for emergency base healing situations
Synergy Units
Boo (Kid) works exceptionally well with:
- The Strongest One – Burn damage during time-stop
- Organs (Berserker) – Pure Evil category synergy
- True Evil (Full Power) – Leader skill stacking
Upgrade Priority
- Rush to Upgrade 1 for Candy Beam
- Focus on reaching Upgrade 3 for AoE Full
- Max out for Sleep ability in infinite modes
Is Boo (Kid) Worth It in 2026?
Despite being unobtainable through normal means, Boo (Kid) remains S+ tier for several reasons:
Pros:
- Unmatched crowd control capability
- Game-saving base healing
- Versatile attack patterns
- Strong leader skills
- Meta-defining presence
Cons:
- Currently unobtainable (trading only)
- High deployment cost (15,000)
- Requires full investment to shine
- Evolution path was expensive
Frequently Asked Questions
Is Boo (Kid) better than Mysterious X?
For pure time-stop utility, yes. Boo (Kid)’s 6.5-second duration and shorter cooldown make him superior for crowd control. However, Mysterious X offers different utility with his damage output.
Can I still get Boo (Kid) in 2026?
Not through direct summoning. Your options are trading with other players or waiting for a potential re-release during special events.
What’s the best trait for Boo (Kid)?
Range or Cooldown traits maximize his crowd control potential. For damage builds, consider Attack or Critical traits.
Is Boo (Kid) good for Story Mode?
Absolutely! His versatile attack types and crowd control make him excellent for clearing difficult story stages.
How much would Boo (Kid) cost in trades?
Trading values fluctuate, but expect to offer multiple high-tier units or exclusive event units due to his rarity and power.
Should I save for Boo (Kid)’s potential return?
If you’re serious about competitive play or infinite mode, absolutely. Start saving gems now for any surprise re-releases.
Comparison with ASTD X Units
With the release of ASTD X, many players wonder how original ASTD units compare. While direct comparisons are difficult due to different mechanics, Boo (Kid)’s utility would still place him in the top tier of any tower defense meta.
Tips for Playing Without Boo (Kid)
If you can’t get Boo (Kid), consider these alternatives:
- Mysterious X – Solid time-stop with good availability
- Patchface – Superior base healing
- Top-tier units from our tier list – Many viable options exist
The Verdict: Absolutely OP
After analyzing every aspect of Boo (Kid)’s kit, there’s no doubt – he’s one of the most overpowered units ever released in All Star Tower Defense. His combination of crowd control, base healing, damage scaling, and versatility creates a unit that excels in every game mode.
While his current unavailability is frustrating, those lucky enough to own Boo (Kid) have a significant advantage. If you ever get the chance to trade for him or if he returns to the game, don’t hesitate – Boo (Kid) is worth every resource you can invest.
For now, keep checking those ASTD codes, stay active in trading communities, and hope for his glorious return. Trust me, once you experience the power of Boo (Kid), you’ll understand why the community still talks about him with such reverence.
Want to dominate without Boo (Kid)? Check out our guides on Tower Defense Simulator for alternative strategies, or explore other tower defense games while you wait for his return!