Comparison

Time Machine vs Letter Drop Challenge

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

Head to head
About

Time Machine

Embark on a thrilling hidden object adventure across time. Solve mysteries, find objects, and restore disassembled items in vibrant, animated 3D environments. Replay scenes for new challenges and rewards.

Highlights
  • Hidden object searching
  • Spot the differences
  • Puzzles
  • Object restoration
  • Time travel exploration
  • Collectible rewards
Features
Read full description

Immerse yourself in an exciting adventure through space and time! Herbert Fink, a young scientist, faces difficult yet fascinating challenges. An ordinary trip out of town turns into a real investigation, full of intrigue and mysterious temporal anomalies! The game is TRULY FREE, the whole adventure is open to you without any additional purchases - it's entirely up to you to buy optional tools. Colorful scenery, animation, and 3D visual effects will make your adventure vivid and fun. Those with a competitive streak can collect bonuses for speed and repeat the quest with new puzzles. Game features: - A variety of tasks: searching for items, spotting the differences, puzzles, restoration of disassembled objects - Explore game locations in the past and in the present! - Build your collection. Go through scenes again to try new quests and get new rewards! - Use free hints! We'll be happy to stay in touch with you at www.facebook.com/CrispApp - make comments, ask questions, get news about coming games!

About

Letter Drop Challenge

Features
Read full description

Letter Drop is the word game that rewards fast thinking over slow deliberation. Swipe through the grid to spell words, clear the block, and beat the clock — every single day. ONE GAME. TWO GAME MODES DAILY CHALLENGE A new puzzle drops every day. six blocks, one chance, one score to beat. Come back tomorrow and go again. SURVIVAL MODE Not ready to stop? Survival mode lets you keep playing, keep clearing, and keep climbing. HOW IT WORKS Swipe connected letters to spell words Longer words score bigger points Clear the block before time runs out Build your streak by playing every day Compete with friends & deep dive your stats Learn new words! Simple to learn. Hard to put down.

Screenshots

Time Machine4 screens
Letter Drop Challenge4 screens

Verdict

The call

The clearest difference is in-app purchases: Letter Drop Challenge at none against Time Machine's 8. Letter Drop Challenge also leads on ads (none vs shown) and update cadence (monthly vs every 5 months). Time Machine's advantage is iOS requirement (13.4 vs 17.6). On price and device support there is nothing between them.

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Time Machine sells 8 one-off in-app purchases. Letter Drop Challenge asks for nothing beyond the download.

UpkeepUpdate frequency

Time Machine ships an update every 5 months, Letter Drop Challenge monthly. The most recent releases landed on October 21, 2026 and October 19, 2026 respectively.

Scorecard4 real differences · 6 level
Time Machine versus Letter Drop Challenge: the parameters behind the verdict, then further details
ParameterTime MachineLetter Drop Challenge
PriceFreeFree
Rating4.5 (4.5K ratings) — better—
Positive reviews64.5% of reviews—
Number of ratings4.5K — better—
Update frequencyEvery 5 monthsMonthly — better
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS13.4 — better17.6
Further details — not scored
Size227 MB9 MB
Age rating9+4+
DeveloperCrisp App StudioEwan Sanderson

Bugs and requests

Time Machine

Reported bugs

2 issues
  • Missing/incorrect objects
  • Glitches with certain features

Requested features

4 requests
  • More levels and content
  • Zoom functionality
  • Customizable brightness/contrast
  • Better instructions and guidance

Letter Drop Challenge

Not enough reviews yet to summarise bugs or requests.

In-app purchases

8 purchases

Time Machine

One-time8
  • Instant Hint$0.99
  • Preview Hints Pack$0.99
  • Handful of Coins$0.99
Show 5 more
  • Infinity Energy + No Ads$1.99
  • Bag with Coins$2.99
  • GoldMaster Special$3.99
  • Сhest with Coins$4.99
  • Master Pack: All-included$7.99
None

Letter Drop Challenge

No in-app purchases

Questions

Is Time Machine free?
Time Machine is free to download, with in-app purchases available.
Is Letter Drop Challenge free?
Letter Drop Challenge is free to download, with no in-app purchases.
Do Time Machine or Letter Drop Challenge have ads?
Time Machine shows ads; Letter Drop Challenge does not.
Which is updated more often, Time Machine or Letter Drop Challenge?
Time Machine ships an update every 5 months, and Letter Drop Challenge monthly. Most recently, Time Machine was updated on October 21, 2026 and Letter Drop Challenge on October 19, 2026.

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