Comparison

Block Harmonics vs Slime Blocks

Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.

Head to head
About

Block Harmonics

Features
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With every placement, a gentle tone layers into a small harmonics. Block Harmonics is a clean, endlessly replayable placement puzzle: drop varied shapes onto an 8Ɨ8 board and clear filled rows and columns. Difficulty adapts gradually to your play. Build combos and simultaneous clears to push your score, and aim for a new personal best. — Highlights — • Variety of pieces: from monomino to pentomino/hexomino. • Smooth controls: tap to pick, drag to place, with helpful snapping. • Scoring that rewards skill: combo chains, row/column simultaneous clears, perfect fits, area wipes, large-piece bonuses. • Sound that feels good: tone and stereo change by color and position; combos sparkle with chords. Ambient BGM supports focus or relaxation. • Settings: toggle SFX, 4-step volume, display handle name. • Offline-friendly: scores are saved on device. Free to play. — How to Play — 1) Choose from three pieces and place them on the board. 2) Fill any row or column to clear it and score points. 3) Clear repeatedly to raise your combo multiplier. The game ends when no placement is possible. — Tips — • Plan for multiple rows/columns at once. • Aim for perfect fits to earn a bonus. • Use large pieces and area clears to spike your score. — About Ads — Block Harmonics is free to play and supported by ads — a banner at the bottom and an optional, skippable ad after game over. — Privacy — Scores and session data stay on your device. Google AdMob may collect anonymized information to serve ads. Compose your own little harmonics of color and shape.

About

Slime Blocks

Features
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Slime Blocks is a block puzzle where every block is a slime with feelings. Drop pieces on the 8Ɨ8 board, fill a row or a column, and watch the slimes panic, laugh and cheer as it pops. 4 modes, 600+ levels, 22 skins to collect. Plays offline, no WiFi needed. MEET THE SLIMES Ruby, Blu, Sprout, Sunny, Grape, Tango, Pinky and Glitch: one slime for every colour. Clear two lines at once and the slime of the piece you placed takes the credit. 4 WAYS TO PLAY • Classic: endless play. Your best score stays on screen, so you always know what to beat. • Adventure: 600+ levels. Each level paints one pixel of a hidden picture. Finish 11 pixel paintings, from the Robot to the Heart to the Bomb, and find them in the Hall of Paintings. • Block Rush: a ghost stole the slimes' candy! Chase it across 10 worlds against the clock, with a boss fight at the end of every world. Unlocks after 8 Adventure levels. • Daily Challenge: a new challenge every day. Grow your streak, earn power-ups and compare scores on the Game Center leaderboards. COMBOS WITHOUT A CLOCK Clear a line, then another within your next 3 moves, and the combo keeps climbing. The combo doesn't run on time: think as long as you like and set up the big one. POWER-UPS Stuck? Use Shuffle, Laser, Splash or Storm to turn the game around. Earn them through achievements, score milestones and the Daily Challenge, or watch a short video for a free one. 22 SKINS TO COLLECT Cool Shades, Pirate Patch, Birthday Blob, Action Heroes and more. 10 skins are free: 4 from the start, 6 earned with achievements. The other 12 come with "Unlock All Skins". Skins are cosmetic: no advantage in play. 69 ACHIEVEMENTS Bronze, Silver, Gold and Diamond. Every achievement gives at least one power-up, and some unlock a skin. PLAYS OFFLINE Every mode plays without a connection: on a plane, on the metro, anywhere. Progress is saved on this device. Reward videos, purchases and leaderboards need the internet. FREE TO PLAY Slime Blocks is free with ads. Ads between games are capped: at most one every 2 minutes, never two games in a row. Optional in-app purchases: "Remove Ads", "Power-Up Pack", "Mega Power-Up Pack", "Unlock All Skins" and "Ultimate Bundle". "Restore Purchases" is in Settings. 11 LANGUAGES English, Ukrainian, French, German, Spanish, Japanese, Korean, Indonesian, Italian, Portuguese and Arabic. No account needed.

Screenshots

Block Harmonics3 screens
Slime Blocks4 screens

Verdict

The call

The clearest difference is in-app purchases: Block Harmonics at none against Slime Blocks's 5. On price, update cadence, ads and device support there is nothing between them.

Scored on Price Ā· Rating Ā· Positive reviews Ā· Number of ratings Ā· Update frequency Ā· Ads Ā· In-app purchases Ā· Monetization Ā· Best chart rank Ā· Devices Ā· Requires iOS

CostPrice Ā· In-app purchases Ā· Ads Ā· Monetization

Both are free to download. Slime Blocks sells 5 one-off in-app purchases. Block Harmonics asks for nothing beyond the download.

UpkeepUpdate frequency

Block Harmonics ships an update every 9 days, Slime Blocks every 2 weeks. The most recent releases landed on November 5, 2026 and November 9, 2026 respectively.

Scorecard1 real difference Ā· 5 level
Block Harmonics versus Slime Blocks: the parameters behind the verdict, then further details
ParameterBlock HarmonicsSlime Blocks
PriceFreeFree
Update frequencyEvery 9 days — betterEvery 2 weeks
AdsYesYes
In-app purchasesNo — betterYes
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.115.0 — better
Further details — not scored
Size31 MB71 MB
Age rating4+4+
DeveloperIkuya TerasakaMykola Ovcharenko

In-app purchases

None

Block Harmonics

No in-app purchases

5 purchases

Slime Blocks

One-time5
  • Power-Up Pack$0.99
  • Remove Ads$1.99
  • Mega Power-Up Pack$1.99
Show 2 more
  • Premium Skin Bundle$2.99
  • Ultimate Bundle$3.99

Questions

Is Block Harmonics free?
Block Harmonics is free to download, with no in-app purchases.
Is Slime Blocks free?
Slime Blocks is free to download, with in-app purchases available.
Do Block Harmonics or Slime Blocks have ads?
Both Block Harmonics and Slime Blocks show ads.
Which is updated more often, Block Harmonics or Slime Blocks?
Block Harmonics ships an update every 9 days, and Slime Blocks every 2 weeks. Most recently, Block Harmonics was updated on November 5, 2026 and Slime Blocks on November 9, 2026.

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