diff --git a/include/game_state.h b/include/game_state.h
index c1c5564..446adde 100644
--- a/include/game_state.h
+++ b/include/game_state.h
@@ -21,7 +21,7 @@ namespace Hanabi {
 
     using rank_t = std::uint8_t;
     using suit_t = std::uint8_t;
-    using clue_t = std::uint8_t;
+    using clue_t = std::int8_t;
     using player_t = std::uint8_t;
     using hand_index_t = std::uint8_t;
 
@@ -220,6 +220,8 @@ public:
     virtual void rotate_next_draw(const Card& card) = 0;
     virtual void revert() = 0;
 
+    virtual void modify_clues(clue_t change) = 0;
+
     [[nodiscard]] virtual player_t turn() const = 0;
     [[nodiscard]] virtual clue_t num_clues() const = 0;
     [[nodiscard]] virtual std::vector<std::vector<Card>> hands() const = 0;
@@ -258,6 +260,7 @@ struct Game {
   void make_turn();
   void revert_turn();
   void forward_until(size_t turn = 100, size_t draw_pile_break = 0);
+  void revert_until(size_t draw_pile_break);
 
 
   std::unique_ptr<HanabiStateIF> state;
@@ -282,6 +285,8 @@ public:
 
     void revert() final;
 
+    void modify_clues(clue_t change) final;
+
     [[nodiscard]] player_t turn() const final;
     [[nodiscard]] clue_t num_clues() const final;
     [[nodiscard]] std::vector<std::vector<Card>> hands() const final;
diff --git a/include/game_state.hpp b/include/game_state.hpp
index 0ebb8cd..11b4d2e 100644
--- a/include/game_state.hpp
+++ b/include/game_state.hpp
@@ -511,6 +511,19 @@ namespace Hanabi {
         }
     }
 
+
+    template<suit_t num_suits, player_t num_players, hand_index_t hand_size>
+    void HanabiState<num_suits, num_players, hand_size>::modify_clues(Hanabi::clue_t change)
+    {
+      _num_clues += change;
+      if (_num_clues > 8) {
+        _num_clues = 8;
+      }
+      if (_num_clues < 0) {
+        _num_clues = 0;
+      }
+    }
+
     template<suit_t num_suits, player_t num_players, hand_index_t hand_size>
     player_t HanabiState<num_suits, num_players, hand_size>::turn() const {
         return _turn;
diff --git a/src/main.cpp b/src/main.cpp
index 97f5a4d..2ca672a 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -12,7 +12,7 @@
 
 namespace Hanabi {
     void analyze_game_and_start_cli(std::variant<int, const char*> game_id, int turn, int draw_pile_size, std::optional<uint8_t> score_goal,
-                                    bool start_cli, bool print_remaining_states, bool quiet) {
+                                    bool start_cli, bool print_remaining_states, bool quiet, clue_t clue_modifier) {
         auto game = Download::get_game(game_id, score_goal);
         if (game.state == nullptr) {
             if(game_id.index() == 0) {
@@ -24,6 +24,7 @@ namespace Hanabi {
         }
 
         game.forward_until(turn, draw_pile_size);
+        game.state->modify_clues(clue_modifier);
 
         if (not quiet) {
           std::cout << "Analysing state: " << std::endl << std::endl << *game.state << std::endl;
@@ -37,8 +38,8 @@ namespace Hanabi {
         std::cout.precision(10);
         if (not (quiet and print_remaining_states)) {
           std::cout << "Probability with optimal play: ";
+          print_probability(std::cout, res) << std::endl;
         }
-        print_probability(std::cout, res) << std::endl;
         if (not quiet) {
           std::cout << "Took " << std::chrono::duration_cast<std::chrono::milliseconds>(end - start) << "." << std::endl;
           std::cout << "Visited " << game.state->enumerated_states() << " states." << std::endl;
@@ -72,6 +73,7 @@ int main(int argc, char *argv[]) {
   int draw_pile_size = 0;
   std::optional<int> score;
   bool interactive_shell;
+  int clue_modifier = 0;
 
   boost::program_options::options_description desc("Allowed options");
   desc.add_options()
@@ -83,6 +85,7 @@ int main(int argc, char *argv[]) {
         ("score,s", boost::program_options::value<int>(), "Score that counts as a win, i.e. is optimized for achieving.")
         ("interactive,i", boost::program_options::value<bool>(&interactive_shell)->default_value(true), "Drop into interactive shell to explore game")
         ("remaining-states,r", "Print probabilities for all further sizes of draw pile.")
+        ("clue-modifier,c", boost::program_options::value<int>(&clue_modifier)->default_value(0), "Modification to the number of clues applied to selected game state.")
         ("quiet,q", "Deactivate all non-essential prints")
   ;
   boost::program_options::variables_map vm;
@@ -111,9 +114,9 @@ int main(int argc, char *argv[]) {
   }
 
   if (vm.count("file")) {
-    Hanabi::analyze_game_and_start_cli(vm["file"].as<std::string>().c_str(), turn, draw_pile_size, score, interactive_shell, vm.count("remaining-states"), vm.count("quiet"));
+    Hanabi::analyze_game_and_start_cli(vm["file"].as<std::string>().c_str(), turn, draw_pile_size, score, interactive_shell, vm.count("remaining-states"), vm.count("quiet"), clue_modifier);
   } else {
-      Hanabi::analyze_game_and_start_cli(vm["id"].as<int>(), turn, draw_pile_size, score, interactive_shell, vm.count("remaining-states"), vm.count("quiet"));
+      Hanabi::analyze_game_and_start_cli(vm["id"].as<int>(), turn, draw_pile_size, score, interactive_shell, vm.count("remaining-states"), vm.count("quiet"), clue_modifier);
   }
   return EXIT_SUCCESS;
 }