diff --git a/lib/engine/game/g_1837/entities.rb b/lib/engine/game/g_1837/entities.rb
index b9ecdb3b2b..fae17cc82f 100644
--- a/lib/engine/game/g_1837/entities.rb
+++ b/lib/engine/game/g_1837/entities.rb
@@ -5,6 +5,15 @@ module Game
     module G1837
       module Entities
         COMPANIES = [
+          {
+            name: 'Block Bosnia-Herzegovina hexes',
+            sym: '3',
+            value: 0,
+            meta: { hidden: true },
+            abilities: [
+              { type: 'blocks_hexes', remove: '3', hexes: %w[L16 L18 L20 M17 M19 M21 N18 N20] },
+            ],
+          },
           {
             name: 'Pilsen-Priesen Railway',
             sym: 'EPP',
diff --git a/lib/engine/game/g_1837/game.rb b/lib/engine/game/g_1837/game.rb
index 0ff8663d53..887ca0de07 100644
--- a/lib/engine/game/g_1837/game.rb
+++ b/lib/engine/game/g_1837/game.rb
@@ -265,7 +265,9 @@ def initial_auction_companies
         end
 
         def setup
-          non_purchasable = @companies.flat_map { |c| c.meta['additional_companies'] }.compact
+          non_purchasable = @companies.flat_map do |c|
+            Array(c.meta['additional_companies']) + [c.meta['hidden'] ? c.id : nil]
+          end.compact
           @companies.each { |company| company.owner = @bank unless non_purchasable.include?(company.id) }
           setup_mines
           setup_minors