Premium Membership

Unlock the full
BLOS Play game library

Premium puzzle games, session tracking, server-issued certificates, achievements, and book-to-digital bonus experiences — powered by the Balthrop Logic Engine™.

Unlimited premium games Server-issued certificates Session & progress tracking Cancel anytime
Free Account

Free Player

Start with selected BLOS Play games and a monthly free-play allowance. No credit card required.

$0/ month
  • 5 free plays per month with account
  • Access to all free-tier games
  • Member dashboard & profile
  • Recently Played activity tracking
  • Local certificate display
  • Premium game library
  • Server-issued certificates
Create Free Account →
⭐ Best Value

BLOS Play Premium

Unlimited access to the full Balthrop Logic game library — the complete premium experience.

$4.99/ month
Billed monthly through Stripe · Cancel anytime
  • Unlimited premium game access
  • Battleship Commander Duel™ included
  • Hashiwokakero, Masyu, Slitherlink, Killer Sudoku & more
  • Server-issued & verifiable certificates
  • Full session & progress tracking
  • Future saved game states
  • Book-to-digital bonus content access
Get Premium Access →
Professional Tier

BLOS Play Pro

Advanced tier for educators, families, and serious players who want deep progress tools and group access.

$9.99/ month
  • Everything in Premium
  • Cloud game states & cross-device sync
  • Certificate history & public verification
  • Achievement records & leaderboards
  • Classroom & family sub-accounts
  • Priority support
  • Future group and education tools
Get BLOS Play Pro →

Access comparison

Feature
Free
Premium
Pro
Monthly free-play allowance
5 plays / month
Unlimited
Unlimited
Premium game library
Not included
All games
All games
Battleship Commander Duel™
Premium only
Included
Included
Member dashboard
Included
Included
Included
Server-issued certificates
Local only
Verifiable
Enhanced
Session & progress tracking
Basic
Full history
Advanced
Future cloud save states
Not included
Planned
Cross-device
Book-to-digital bonus content
Not included
Planned
Full access
Family / classroom accounts
Not included
Not included
Planned
How does Premium billing work?
Premium memberships are billed monthly through Stripe and may be cancelled at any time from your account dashboard.
What games are included in Premium?
Battleship Commander Duel™, Hashiwokakero, Masyu, Slitherlink, Killer Sudoku Pro, Samurai Capstone, Kakuro, and Suguru — plus every future premium game added to the library.
What are server-issued certificates?
When you complete a verified milestone, the BLOS Play server issues a permanent certificate with a unique credential code — verifiable through the public verification API.
Does Free access require a credit card?
No. Create a free account with just your email — no credit card required for the free tier.
Can I cancel anytime?
Yes. Premium is billed monthly. Cancel before your next billing date and you keep access until the end of your paid period.
Do I keep my progress if I downgrade?
Your session history, dashboard activity, and earned certificates are retained. Premium game access reverts to the free tier if you cancel.